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. …

Jul 23, 2013 · $\\mathbb Q$ is used to represent rational numbers. $\\mathbb R$ is used to represent reals. Is there a symbol or convention that represents irrationals. Possibly $\\mathbb …

Jun 25, 2014 · I have started seeing the "∈" symbol in math. What exactly does it mean? I have tried googling it but google takes the symbol out of the search.

In set theory \mid or : is often used but I haven't really seen any logical symbol used for "such that" in other situations. But now that I think of it there is the \ni symbol used as "such that" in …

There is a common thread running through many of the mysteries and hints in the series—the mysterious symbol, (alleged) astronomical symbols, cannibalism, and the sign of the bird and …

Jan 25, 2021 · This is probably the stupidest thing I've ever needed help with, but I've read you can format sign text to different colours using § codes but I cannot for the life of me figure out …

Aug 31, 2019 · Either \propto or \varpropto seems to give the correct symbol. TeX often uses "var" to indicate a variation of a symbol (for example \epsilon $\epsilon$ vs \varepsilon …

I just came across this annotation in my school's maths compendium: The compendium is very brief and doesn't explain what this means.

Aug 3, 2015 · Here's another symbol I've seen for the primes: $\mathcal {P}$. I think it was in an ArXiV paper, I doubt it was in an actual book from a library. Don't use $\mathfrak {P}$, though, …

13 I have found some pretty complete lists (I think) of mathematical symbols here and here, but I don't see a symbol for the word "and" on either list. A person could easily just write the word …