For example, the sum is asymptotically equal to k. No consistent notation is used throughout mathematics and some texts use ? to mean approximately equal and ~ to mean asymptotically equal whereas other texts use the symbols the other way around.

Typography

The approximately equals sign, ?, was introduced (in a slightly different version) by the British mathematician Alfred Greenhill in 1892, in his book Applications of Elliptic Functions.

LaTeX symbols

Typical

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