Mar 18, 2011 · I have seen variants of these used by people who predate widespread knowledge of computer programming. It would be interesting to know the earliest uses of a special symbol for this (and what symbols were chosen). An advantage of $:=$ is that it has a partner, $=:$, allowing it to distinguish which side is equal to the other by definition.

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.

Jul 29, 2014 · See also; why do these odd symbols appear in my emails _ you’ve; Why are my emails corrupted with weird letters and symbols?

Jul 23, 2013 · When I first learned, the symbol $\mathbb{K}$ was used. Obviously, though, given the relative infrequency of the need of calling out the set by name, if you do use a symbol, introduce it with "$= \mathbb{R} - \mathbb{Q}$" or something similar.

Nov 13, 2020 · Meaning of symbol $\looparrowright$ in math Hot Network Questions Hide all the equations in a document, including `align`, `subequations`

The symbol resembles shapes used in trigonometry, which goes some way towards explaining, if I am right, how it came to represent an occultation, but it would be next to useless on its own. My fan theory is simply this: When the writers reveal how the survivors returned to New Jersey, occultation will come into play, and it will become apparent ...

Sep 25, 2020 · The symbol for the absolute difference is $\Delta$. $$ \Delta P = P_2 - P_1 $$ Is there an equivalent symbol for the relative difference? $$ \text{Relative difference} = \frac{\Delta P}{P_1} $$

$\begingroup$ 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 mathematical logic I believe. $\endgroup$ –

Jun 25, 2014 · Another possible notation for the same relation is {\displaystyle A\ni x,} A\ni x, meaning "A contains x", though it is used less often. The negation of set membership is denoted by the symbol "∉". Writing {\displaystyle x\notin A} x\notin A means that "x is not an element of A".

Mar 7, 2019 · 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 "and" or use an ampersand, but I was wondering if there was an actual mathematical symbol for the word "and".