Propositional logic

This is the part of the formalization of mathematics that deals only with the propositions.

In some systems, e.g. including Metamath, modus ponens alone tends to be enough, everything else can be defined based on it.

Table of contents
- Modus ponens Propositional logic
- If and only if Propositional logic

Modus ponens

If and only if (Iff)

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First-order logic

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