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The mathematical symbol for "undefined" is the infinity symbol.
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Pi.
Pi as a mathematical symbol was introduced by William Jones in 1706
What mathematical symbol? Different symbols were invented in different times and places.
' is the symbol for foot
"why" is not a mathematical symbol.
It's a mathematical metaphor.
There is no standard symbol for subring
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The mathematical symbol for "undefined" is the infinity symbol.
A. C. Leisenring has written: 'Mathematical logic and Hilbert's & symbol' -- subject(s): Symbolic and mathematical Logic 'Mathematical logic and Hilbert's E-Symbol'
< this symbol can also mean less than