Reorganize RDF/XML/Ontology notes.

main
Joshua Potter 2024-12-21 11:31:21 -07:00
parent b314d47f3c
commit e82c40f662
10 changed files with 382 additions and 217 deletions

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@ -692,7 +692,7 @@
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@ -791,7 +791,7 @@
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@ -1017,7 +1017,7 @@
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},
"fields_dict": {
"Basic": [

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@ -1,124 +1,3 @@
---
title: Ontology
TARGET DECK: Obsidian::H&SS
FILE TAGS: ontology
tags:
- ontology
---
## Overview
Ontology is the philosophical study of being. Generally *things* are split into two broad categories: **abstract** and **concrete** things. These words are "terms of art" and their definition is not standardized in any way.
%%ANKI
Basic
What did Quine declare as *the* ontological question?
Back: "What is there?"
Reference: Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).
<!--ID: 1720912238054-->
END%%
%%ANKI
Basic
Who is attributed *the* ontological question?
Back: Willard Van Orman Quine.
Reference: Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).
<!--ID: 1720912259767-->
END%%
%%ANKI
Cloze
{Ontology} is the {philosophical study of being}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238058-->
END%%
%%ANKI
Cloze
{Epistemology} is the {philosophical study of knowledge}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238062-->
END%%
%%ANKI
Cloze
{Taxonomy} is the {branch of science concerned with categorization}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238066-->
END%%
%%ANKI
Cloze
{Mereology} is the {philosophical study of part-whole relationships}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720998380912-->
END%%
%%ANKI
Basic
What does Effingham mean when saying "concreta" and "abstracta" are terms of art?
Back: They are terms defined freely by a person to mean whatever one wants.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782942-->
END%%
%%ANKI
Cloze
In general, ontologists often categorize things as either {concreta} or {abstracta}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782951-->
END%%
%%ANKI
Basic
Generally speaking, what does someone *probably* mean by "concrete" things?
Back: Things that exists in space and/or time.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782957-->
END%%
%%ANKI
Basic
Generally speaking, what does someone *probably* mean by "abstract" things?
Back: Things that exist in neither space nor time.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782965-->
END%%
%%ANKI
Basic
Is a material object considered concreta?
Back: Usually.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782971-->
END%%
%%ANKI
Basic
Is an immaterial object considered concreta?
Back: Possibly.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782978-->
END%%
%%ANKI
Basic
Is a material object considered abstracta?
Back: Not usually.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782984-->
END%%
%%ANKI
Basic
Is an immaterial object considered abstracta?
Back: Possibly.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782989-->
END%%
## Bibliography
* Francesco Orilia and Michele Paolini Paoletti, “Properties,” in _The Stanford Encyclopedia of Philosophy_, ed. Edward N. Zalta, Spring 2022 (Metaphysics Research Lab, Stanford University, 2022), [https://plato.stanford.edu/archives/spr2022/entries/properties/](https://plato.stanford.edu/archives/spr2022/entries/properties/).
* Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
* Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).

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@ -0,0 +1,124 @@
---
title: Ontology (Philosophy)
TARGET DECK: Obsidian::H&SS
FILE TAGS: ontology
tags:
- ontology
---
## Overview
Ontology is the philosophical study of being. Generally *things* are split into two broad categories: **abstract** and **concrete** things. These words are "terms of art" and their definition is not standardized in any way.
%%ANKI
Basic
What did Quine declare as *the* ontological question?
Back: "What is there?"
Reference: Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).
<!--ID: 1720912238054-->
END%%
%%ANKI
Basic
Who is attributed *the* ontological question?
Back: Willard Van Orman Quine.
Reference: Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).
<!--ID: 1720912259767-->
END%%
%%ANKI
Cloze
{Ontology} is the {philosophical study of being}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238058-->
END%%
%%ANKI
Cloze
{Epistemology} is the {philosophical study of knowledge}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238062-->
END%%
%%ANKI
Cloze
{Taxonomy} is the {branch of science concerned with categorization}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720912238066-->
END%%
%%ANKI
Cloze
{Mereology} is the {philosophical study of part-whole relationships}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720998380912-->
END%%
%%ANKI
Basic
What does Effingham mean when saying "concreta" and "abstracta" are terms of art?
Back: They are terms defined freely by a person to mean whatever one wants.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782942-->
END%%
%%ANKI
Cloze
In general, ontologists often categorize things as either {concreta} or {abstracta}.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782951-->
END%%
%%ANKI
Basic
Generally speaking, what does someone *probably* mean by "concrete" things?
Back: Things that exists in space and/or time.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782957-->
END%%
%%ANKI
Basic
Generally speaking, what does someone *probably* mean by "abstract" things?
Back: Things that exist in neither space nor time.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782965-->
END%%
%%ANKI
Basic
Is a material object considered concreta?
Back: Usually.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782971-->
END%%
%%ANKI
Basic
Is an immaterial object considered concreta?
Back: Possibly.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782978-->
END%%
%%ANKI
Basic
Is a material object considered abstracta?
Back: Not usually.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782984-->
END%%
%%ANKI
Basic
Is an immaterial object considered abstracta?
Back: Possibly.
Reference: Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
<!--ID: 1720894782989-->
END%%
## Bibliography
* Francesco Orilia and Michele Paolini Paoletti, “Properties,” in _The Stanford Encyclopedia of Philosophy_, ed. Edward N. Zalta, Spring 2022 (Metaphysics Research Lab, Stanford University, 2022), [https://plato.stanford.edu/archives/spr2022/entries/properties/](https://plato.stanford.edu/archives/spr2022/entries/properties/).
* Nikk Effingham, _An Introduction to Ontology_ (Cambridge: Polity Press, 2013).
* Simon Hewitt, “A Cardinal Worry for Permissive Metaontology,” _Metaphysica_ 16, no. 2 (September 18, 2015): 15965, [https://doi.org/10.1515/mp-2015-0009](https://doi.org/10.1515/mp-2015-0009).

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@ -1,7 +1,7 @@
---
title: RDF
TARGET DECK: Obsidian::STEM
FILE TAGS: rdf
FILE TAGS: ontology::rdf
tags:
- rdf
---
@ -10,6 +10,8 @@ tags:
The **Resource Description Framework** (RDF) is the foundational representation language of the Semantic Web. The basic building block of RDF is the **triple** containing a **subject**, **predicate**, and **object**. Global identifiers of resources are represented as [[uri|URIs]] (or, more generally, IRIs). These URIs can be expressed more compactly as [[uri#CURIEs|CURIEs]].
A **graph** is a set of triples. A **named graph** is a particular set of triples with an associated name. When using named graphs, the term **quads** is often used in favor of triples. This refers to the original triple along with the name of the graph the triple is associated with.
%%ANKI
Basic
Which organization standardized RDF?
@ -128,114 +130,62 @@ Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web
<!--ID: 1722191359882-->
END%%
## Reification
**Reification** refers to the process by which an abstract idea is made concrete. In the context of RDF, it refers to writing RDF statements about RDF statements.
%%ANKI
Basic
What is reification?
Back: The process by which an abstract idea is made concrete.
Reference: “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).
<!--ID: 1734385502410-->
END%%
%%ANKI
Basic
In the context of RDF, what does reification typically refer to?
Back: Creating RDF statements about RDF statements.
Reference: “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).
<!--ID: 1734385502419-->
END%%
%%ANKI
Basic
In the context of RDF, what abstract notion is typically reified?
Back: RDF statements.
How does RDF define a graph?
Back: As a set of triples.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502422-->
<!--ID: 1734804443458-->
END%%
%%ANKI
Basic
What term describes making an abstract concept concrete?
Back: Reification.
How does RDF define a named graph?
Back: A graph with a name.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502427-->
<!--ID: 1734804443462-->
END%%
This kind of metadata about statements often take the forms of:
* **Provenance**. Information about the source of a statement.
* **Likelihood**. Information quantifying some probability regarding the statement.
* **Context**. Information about a setting in which a statement holds.
* **Time frame**. Information that holds within a particular period of time.
%%ANKI
Basic
What might reifying a statement with respect to its provenance refer to?
Back: Information about the source of the statement.
Cloze
{1:Triples} are to {2:graphs} whereas {2:quads} are to {1:named graphs}.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502431-->
<!--ID: 1734804443465-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Wikipedia says Shakespeare wrote Hamlet.}$$
Back: Provenance.
What name is given to the members of a triple?
Back: "Subject", "predicate", and "object".
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502435-->
<!--ID: 1734804443466-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its likelihood refer to?
Back: Information quantifying some probability of the statement holding.
What name is given to the members of a quad?
Back: "Subject", "predicate", "object", and "graph".
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502439-->
<!--ID: 1734804443468-->
END%%
%%ANKI
Cloze
RDF is a {data model} whereas XML is a {serialization}.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
Tags: xml
<!--ID: 1734805690321-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{It is 90\% probable that Shakespeare wrote Hamlet.}$$
Back: Likelihood.
How might RDF and XML relate to one another?
Back: XML can be used to serialize RDF.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502443-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its context refer to?
Back: Information about a setting in which the statement holds.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502448-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Kenneth Branagh played Hamlet in the movie.}$$
Back: Context.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502453-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its time frame refer to?
Back: Information about a period of time in which the statement holds.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502458-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Hamlet plays on Broadway Jan. 11th through Mar. 12th.}$$
Back: Time frame.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502463-->
Tags: xml
<!--ID: 1734805690328-->
END%%
## Bibliography
* Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
* “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).

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@ -0,0 +1,119 @@
---
title: Reification
TARGET DECK: Obsidian::H&SS
FILE TAGS: ontology
tags:
- ontology
---
## Overview
**Reification** refers to the process by which an abstract idea is made concrete. For example, in the context of [[rdf|RDF]], it refers to writing RDF statements about RDF statements.
%%ANKI
Basic
What is reification?
Back: The process by which an abstract idea is made concrete.
Reference: “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).
<!--ID: 1734385502410-->
END%%
%%ANKI
Basic
In the context of RDF, what does reification typically refer to?
Back: Creating RDF statements about RDF statements.
Reference: “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).
<!--ID: 1734385502419-->
END%%
%%ANKI
Basic
In the context of RDF, what abstract notion is typically reified?
Back: RDF statements.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502422-->
END%%
%%ANKI
Basic
What term describes making an abstract concept concrete?
Back: Reification.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502427-->
END%%
This kind of metadata about statements often take the forms of:
* **Provenance**. Information about the source of a statement.
* **Likelihood**. Information quantifying some probability regarding the statement.
* **Context**. Information about a setting in which a statement holds.
* **Time frame**. Information that holds within a particular period of time.
%%ANKI
Basic
What might reifying a statement with respect to its provenance refer to?
Back: Information about the source of the statement.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502431-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Wikipedia says Shakespeare wrote Hamlet.}$$
Back: Provenance.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502435-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its likelihood refer to?
Back: Information quantifying some probability of the statement holding.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502439-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{It is 90\% probable that Shakespeare wrote Hamlet.}$$
Back: Likelihood.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502443-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its context refer to?
Back: Information about a setting in which the statement holds.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502448-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Kenneth Branagh played Hamlet in the movie.}$$
Back: Context.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502453-->
END%%
%%ANKI
Basic
What might reifying a statement with respect to its time frame refer to?
Back: Information about a period of time in which the statement holds.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502458-->
END%%
%%ANKI
Basic
What "form" of reification does the following sentence take on? $$\text{Hamlet plays on Broadway Jan. 11th through Mar. 12th.}$$
Back: Time frame.
Reference: Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
<!--ID: 1734385502463-->
END%%
## Bibliography
* Allemang, Dean, James A. Hendler, and Fabien L. Gandon. _Semantic Web for the Working Ontologist_. 3e ed. ACM Books 33. New York: Association for computing machinery, 2020.
* “Reification (Knowledge Representation),” in _Wikipedia_, October 3, 2023, [https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)](https://en.wikipedia.org/w/index.php?title=Reification_(knowledge_representation)&oldid=1178437461).

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@ -62,17 +62,11 @@ END%%
No set is equinumerous to its [[set/index#Power Set Axiom|power set]]. This is typically shown using a diagonalization argument.
%%ANKI
Basic
What basic set operation produces a new set the original isn't equinumerous to?
Back: The power set operation.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1732541309202-->
END%%
For any set $A$, $^A2 \approx \mathscr{P}(A)$.
%%ANKI
Basic
What kind of argument is typically made to prove no set is equinumerous to its power set?
What kind of argument is typically used to show $A \not\approx {\mathscr{P}(A)}$?
Back: A diagonalization argument.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1732541309208-->
@ -102,6 +96,94 @@ Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Pre
<!--ID: 1732541309221-->
END%%
%%ANKI
Basic
For any set $A$, $\mathscr{P}(A)$ is equinumerous to what set of functions?
Back: $^A2$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734802664285-->
END%%
%%ANKI
Basic
Let $A$ be any set. How is bijection $H \colon \,^A2 \rightarrow \mathscr{P}(A)$ typically defined?
Back: $H(f) = \{a \in A \mid f(a) = 1\}$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734802664293-->
END%%
%%ANKI
Basic
For any set $A$, $^A2$ is equinumerous to what of $A$?
Back: Its powerset.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734802664297-->
END%%
%%ANKI
Basic
What kind of argument is typically used to show $A \not\approx {^A2}$?
Back: A diagonalization argument.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734802664301-->
END%%
%%ANKI
Basic
For any set $A$, what is the cardinality of its powerset?
Back: $2^{\mathop{\text{card}}A}$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273736-->
END%%
%%ANKI
Basic
What does $\mathop{\text{card}} \mathscr{P}(A)$ evaluate to?
Back: $2^{\mathop{\text{card}}A}$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273739-->
END%%
%%ANKI
Basic
The cardinality of what set equals $2^{\mathop{\text{card}}A}$?
Back: $\mathscr{P}(A)$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273741-->
END%%
%%ANKI
Basic
What does $\mathop{\text{card}} \mathscr{P}(\omega)$ evaluate to?
Back: $2^{\aleph_0}$
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273742-->
END%%
%%ANKI
Basic
Why is the "power set" named the way it is?
Back: Because $\mathop{\text{card}} \mathscr{P}(A)$ equals $2$ to the power of $\mathop{\text{card}} A$.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273743-->
END%%
%%ANKI
Basic
*How* do we know $\aleph_0 \not\approx 2^{\aleph_0}$ holds?
Back: No set is equinumerous to its power set.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273744-->
END%%
%%ANKI
Basic
For any cardinal number $\kappa$, *how* do we know $\kappa \not\approx 2^\kappa$?
Back: No set is equinumerous to its power set.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273745-->
END%%
### Equivalence Concept
For any sets $A$, $B$, and $C$:
@ -867,6 +949,13 @@ Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Pre
<!--ID: 1734520487359-->
END%%
%%ANKI
Cloze
For any cardinal number $\kappa$, addition's {$\kappa + \kappa$} equals multiplication's {$2 \cdot \kappa$}.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
<!--ID: 1734803273746-->
END%%
### Exponentiation
Let $\kappa$ and $\lambda$ be any cardinal numbers. Then $\kappa^\lambda = \mathop{\text{card}}(^LK)$, where $K$ and $L$ are any sets of cardinality $\kappa$ and $\lambda$, respectively.