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The logic of classical language/pt (view source)
Revision as of 17:00, 3 November 2021
, 3 years agoCreated page with "Demonstração por absurdo"
#''Filiação'', que é indicado pelo símbolo <math>\in</math> (is an element of) ou pelo símbolo <math>\not\in</math> (is not an element of):
#''Filiação'', que é indicado pelo símbolo <math>\in</math> (is an element of) ou pelo símbolo <math>\not\in</math> (is not an element of):
===Demonstration by absurdity===
===Demonstração por absurdo===
Furthermore, in classical logic there is a principle called the <u>excluded third</u> which declares that a sentence that cannot be false must be taken as true since there is no third possibility.
Furthermore, in classical logic there is a principle called the <u>excluded third</u> which declares that a sentence that cannot be false must be taken as true since there is no third possibility.