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Of or relating to valid reasoning or the study of modes of reasoning.

Contributors in Logic



Philosophy; Logic

In logic and metaphysics, contingency designates a modality which is often erroneously described as 'coincidental'. A condition is contingent if and only if it is neither necessary nor impossible. ...

The Priority Principle

Philosophy; Logic

A philosophical theorem that states that causal events precede their effects in a window of time not long before and no time afterwards. Essentially, it is direct cause and effect; or that event A ...

consistency principle

Philosophy; Logic

A theorem that states that causal events relate, and are consistent with, their effects. Moreover, effects should be consistent with, and be related to, their causes. Simply, an effect is aligned ...

socratic elenchos

Philosophy; Logic

This is a term for the way that philosopher Socrates would examine coming up with new philosophies, and is covered in his work "Euthyphro." It is characterized by answering questions with questions ...

cogito ergo sum

Philosophy; Logic

This is Descartes's most famous claim, which translates to "I think, therefore I am." The cogito expresses an identity statement that can also be states as "Thinking here now", or thinking exists. If ...

paradox of determinism

Philosophy; Logic

The paradox consists of 3 points: 1. Relations of causal connections (ie: cause leads to effect) is the same as relations of logical implications, or ideas 2. A particular human mind is the set of ...


Philosophy; Logic

The existence of opposition; finding inconsistency between two things.

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