Examlex
No non-A are non-B. (F) Obversion
Quantifier Negation
The process of changing the quantifier in a statement, such as from "all" to "not all," to negate its original meaning.
Universal Generalization
A principle of deductive reasoning that allows one to conclude that something is true for all cases after confirming it is true in every observed case.
Existential Instantiation
A logical principle that states from the knowledge that something exists, one can infer the existence of an instance of that thing.
Universal Instantiation
A logical rule that allows one to deduce that a statement applies to specific instances given it holds for all instances.
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