The symbol ≅ is used for isomorphism of objects of a category, and in particular for isomorphism of categories (which are objects of CAT). The symbol ≃ is used for equivalence of categories. At least, this is the convention used in this book and by most category theorists, although it is far from universal in mathematics at large.

Aug 12, 2015 · To indicate approximate equality, one can use ≃, ≅, ~, ♎, or ≒. I need to indicate an approximate inequality. Specifically, I know A is greater than a quantity of approximately B. Is there a way to

Jan 12, 2018 · $\begingroup$ You mentioned in a comment above that using the symbol $\approx$ concerns you because it leaves out information such as the level of precision and accuracy. But being in favor of using $1/17 = 0.0588\ldots $ as an alternative trades one ambiguity for another.

A strange symbol like `¿` of \meaning with pdflatex but normal in xelatex Strings and arrays in Project Valhalla Travel booking concerns due to drastic price and option differences

Jul 28, 2010 · Any mathematical notation is ok as long as it is common knowledge in your community. For instance, I believe I fully understand the meaning of the $\approx$ symbol. However, I haven't ever seen the second symbol you provided. To be on the sure side you should provide a definition of any relation symbol you don't consider to be common knowledge.

Feb 13, 2014 · In Unicode, the symbol $\lessapprox$ is named “LESS-THAN OR APPROXIMATE”, which describes pretty much the meaning you are after. It also is built from the symbols $<$ (less than) and $\approx$ (approximately equal) in the very same way as $\leqq$ (less or equal) is built from $<$ (less) and $=$ (equal).

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Mar 7, 2021 · For my latest maths PSMT, the teacher has specified that equals signs should only be used if the values are actually equal. Does that mean I should use an approximation sign if I'm rounding the val...

Sep 27, 2021 · The symbol “ $=$ ” is used to express the fact that both sides name the same object, whereas “ $\approx$ ” is used to build equations which may or may not be true of particular elements. (A careful study of $\approx$ is given in Chapter II.)

Dec 16, 2018 · That is the standard symbol representing the rest of the decimal representation of pi. In that case you should use "=". pi is approximately equal to 3.14 but exactly equal to 3.14.... $\endgroup$