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== Mathematics and formal logic== {{anchor|Mathematics|reason=Original section name.}} In [[mathematics]], "'''?'''" commonly denotes [[Minkowski's question mark function]]. In [[linear logic]], the question mark denotes one of the exponential modalities that control weakening and contraction. When placed above the relational symbol in an [[equation]] or [[inequality (mathematics)|inequality]], a question-mark annotation means that the stated relation is "questioned". This can be used to ask whether the relation might be true or to point out the relation's possible invalidity. *{{unichar|225F|QUESTIONED EQUAL TO}} *{{unichar|2A7B|LESS-THAN WITH QUESTION MARK ABOVE}} *{{unichar|2A7C|GREATER-THAN WITH QUESTION MARK ABOVE}}
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