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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“It is a monstrous thing to force a child to learn Latin or Greek or mathematics on the ground that they are an indispensable gymnastic for the mental powers. It would be monstrous even if it were true.”
—George Bernard Shaw (1856–1950)
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