Statements (16)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
class of modal logic formulas
|
| gptkbp:characterizedBy |
canonicity
first-order definability |
| gptkbp:hasProperty |
first-order correspondents can be computed algorithmically
admit effective completeness admit effective correspondence preserved under taking bounded morphic images preserved under taking generated subframes preserved under taking ultraproducts |
| https://www.w3.org/2000/01/rdf-schema#label |
Sahlqvist formulas
|
| gptkbp:introducedIn |
1975
|
| gptkbp:namedAfter |
gptkb:Henrik_Sahlqvist
|
| gptkbp:subclassOf |
modal formulas
|
| gptkbp:usedIn |
gptkb:logic
|
| gptkbp:bfsParent |
gptkb:Sahlqvist_theorem
|
| gptkbp:bfsLayer |
7
|