Mathematics
In mathematics, "?" commonly denotes Minkowski's question mark function. In equations, it can mean "questioned" as opposed to "defined".
- U+225F ≟ questioned equal to
- U+2A7B ⩻ less-than with question mark above
- U+2A7C ⩼ greater-than with question mark above
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“The three main medieval points of view regarding universals are designated by historians as realism, conceptualism, and nominalism. Essentially these same three doctrines reappear in twentieth-century surveys of the philosophy of mathematics under the new names logicism, intuitionism, and formalism.”
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