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.

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 …

Dec 13, 2016 · An unsophisticated question from a neophyte: Given the numbers: $1,2,3,4,5$ What is the symbol for the range of the numbers? i.e. the lowest-highest number in the set. …

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 …

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

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 …

It‘s the Monas Hieroglyphica, first appeared in John Dees‘ same called book. It embodies Dees‘ personal vision of the universe and combines many esoteric and astronomical symbols. Here …

Jun 4, 2018 · This verbose form is perfectly acceptable in situations where it's not worth burdening the audience with an obscure symbol for something you won't use very often anyway.