Statements (17)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:logical_axiom
|
| gptkbp:alsoKnownAs |
reflexivity axiom
|
| gptkbp:expressedIn |
reflexivity of accessibility relation
|
| gptkbp:firstAppearance |
early 20th century
|
| gptkbp:implies |
if something is necessary, then it is the case
|
| gptkbp:includedIn |
modal logic system S4
modal logic system S5 modal logic system T |
| gptkbp:namedAfter |
gptkb:C.I._Lewis
|
| gptkbp:relatedTo |
gptkb:Kripke_semantics
necessity operator |
| gptkbp:role |
ensures every world accesses itself
|
| gptkbp:symbol |
□A → A
|
| gptkbp:usedIn |
gptkb:logic
|
| gptkbp:bfsParent |
gptkb:modal_logic_T
|
| gptkbp:bfsLayer |
8
|
| https://www.w3.org/2000/01/rdf-schema#label |
T axiom
|