Masked man paradox
E368057
The Masked man paradox is a classic logical puzzle about knowledge and identity that illustrates how substituting co-referential terms in epistemic contexts can lead to apparent contradictions.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Horned man paradox | 3 |
| Bald man paradox | 2 |
| Masked man paradox canonical | 2 |
| masked man fallacy | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3550534 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Masked man paradox Context triple: [Eubulides of Miletus, knownFor, Masked man paradox]
-
A.
Behind a Mask
"Behind a Mask" is a sensation-style novella by Louisa May Alcott, originally published under a pseudonym, that follows a cunning governess who deceives a wealthy family for personal gain.
-
B.
Mask Off
"Mask Off" is a hit hip-hop single by Future, produced by Metro Boomin, known for its haunting flute sample and widespread cultural impact.
-
C.
Paradox
Paradox is a relational database management system and development environment originally popular on DOS and Windows, known for its ease of use and integration with Borland’s programming tools.
-
D.
Mask of the Man with the Broken Nose
Mask of the Man with the Broken Nose is an early, expressive portrait sculpture by Auguste Rodin that is often regarded as a pivotal work in the development of modern sculpture.
-
E.
Kissing the Mask
Kissing the Mask is a nonfiction book by William T. Vollmann that explores the art, history, and aesthetics of Japanese Noh theater through travel, interviews, and personal reflection.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Masked man paradox Target entity description: The Masked man paradox is a classic logical puzzle about knowledge and identity that illustrates how substituting co-referential terms in epistemic contexts can lead to apparent contradictions.
-
A.
Behind a Mask
"Behind a Mask" is a sensation-style novella by Louisa May Alcott, originally published under a pseudonym, that follows a cunning governess who deceives a wealthy family for personal gain.
-
B.
Mask Off
"Mask Off" is a hit hip-hop single by Future, produced by Metro Boomin, known for its haunting flute sample and widespread cultural impact.
-
C.
Paradox
Paradox is a relational database management system and development environment originally popular on DOS and Windows, known for its ease of use and integration with Borland’s programming tools.
-
D.
Mask of the Man with the Broken Nose
Mask of the Man with the Broken Nose is an early, expressive portrait sculpture by Auguste Rodin that is often regarded as a pivotal work in the development of modern sculpture.
-
E.
Kissing the Mask
Kissing the Mask is a nonfiction book by William T. Vollmann that explores the art, history, and aesthetics of Japanese Noh theater through travel, interviews, and personal reflection.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
epistemic paradox
ⓘ
logical puzzle ⓘ philosophical paradox ⓘ |
| addressedBy |
epistemic logic
ⓘ
intensional semantics ⓘ modal logic ⓘ |
| aimsToShow |
that co-referential names may not be cognitively equivalent
ⓘ
that identity statements cannot always be substituted in knowledge contexts ⓘ |
| basedOn |
Leibniz’s Law
ⓘ
linked to:
identity of indiscernibles
|
| concerns |
co-referential terms
ⓘ
identity and knowledge ⓘ intensionality ⓘ propositional attitudes ⓘ |
| exampleFormulation | I know who my father is; I do not know who the masked man is; therefore the masked man is not my father ⓘ |
| field |
epistemic logic
ⓘ
philosophical logic ⓘ philosophy of language ⓘ philosophy of mind ⓘ |
| illustrates |
distinction between sense and reference
ⓘ
failure of substitutivity in intensional contexts ⓘ limitations of Leibniz’s Law in epistemic contexts ⓘ opacity of propositional attitude contexts ⓘ problems of substituting co-referential terms ⓘ |
| involves |
belief attributions
ⓘ
knowledge attributions ⓘ |
| logicalForm | substitution of identicals in epistemic contexts ⓘ |
| problemType | apparent contradiction ⓘ |
| relatedConcept |
Fregean sense and reference
ⓘ
Kripkean rigid designators ⓘ Leibniz’s Law of the Indiscernibility of Identicals ⓘ
linked to:
identity of indiscernibles
belief ascriptions ⓘ de dicto belief ⓘ de re belief ⓘ intensional context ⓘ knowledge ascriptions ⓘ propositional attitude reports ⓘ referential opacity ⓘ substitution salva veritate ⓘ |
| resolutionApproach |
analyzing knowledge ascriptions with possible worlds semantics
ⓘ
distinguishing between different modes of presentation of the same individual ⓘ restricting substitution in intensional contexts ⓘ |
| typicalScenario | a person claims to know one individual but not recognize the same individual when masked ⓘ |
| usedIn |
discussions of identity and reference
ⓘ
introductory logic courses ⓘ philosophy of language teaching ⓘ |
| uses | epistemic contexts ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Masked man paradox Description of subject: The Masked man paradox is a classic logical puzzle about knowledge and identity that illustrates how substituting co-referential terms in epistemic contexts can lead to apparent contradictions.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Masked man paradox
linked to: Masked man paradox
linked to: Masked man paradox
linked to: Masked man paradox
linked to: Masked man paradox
linked to: Masked man paradox