User:Boris Tsirelson/Sandbox1

Consistent or inconsistent

If a theory states that 2+2=5, it is a paradox but not yet a contradiction. By "paradox" people may mean

• a contradiction;
• an apparent contradiction;
• something counterintuitive;
• something surprising;
• something ironic;

etc.

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wp:Strict conditional

wp:Paradoxes of material implication

wp:Relevance logic