Aug 16, 2011 · Although there is (lamentably) no universally acknowledged symbol for ''opposite'' in the mathematical language (as is commonly the case in math*), there is a symbol for opposite in accordance to some: the minus sign; ''-''. The Thing, is equal to the opposite opposite of The Thing: x=-(-x) [or, as in logic gates (computer tech): AND=-(NAND)]

What does the $\ni$ (backwards element of) symbol mean? It doesn't appear in the Wikipedia list of mathematical symbols, and a Google search for "backwards element of" or "backwards epsilon" turns up contradictory (or unreliable) information. It seems it can mean both "such that", or "contains as an element".

This inversion of Latin letters as symbols (and inversion of symbols to signify their 'opposite' operation) was followed by later logicians: $∀$ (Gentzen, 1935: inverted A from "All-Zeichen" / "Für Alle", by analogy to $∃$) $⊥$ (inverted $⊤$)

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 29, 2006 · The symbol that is the opposite of a slash (or /) or stroke, in French, to my knowledge, is referred to as 'anti-slash', on the basis of the English word 'slash'. The symbol is: \ The symbol is: \ However, 'anti-slash' is not, to the best of my knowledge, used in English; I believe the English term is 'reverse slash'.

what does ∇ (upside down triangle) symbol mean in this problem. Ask Question Asked 14 years, 4 months ago.

Dec 12, 2021 · $\begingroup$ I suggest you post this as an answer, because I'm starting to think that there is no such symbol, in which case this would be the correct answer! $\endgroup$ – François Huppé Commented Dec 12, 2021 at 8:22

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".

Jan 5, 2019 · $\wedge$ is (most often) the mathematical symbol for logical conjunction, which is equivalent to the AND operator you're used to. Similarly $\vee$ is (most often) logical disjunction , which would be equivalent to the OR operator.

The symbol $\mp$ only appears when there's already a $\pm$, but we want to establish a correspondence between opposite signs in an equation. Note that it's only a matter of style; we could dispose completely of $\mp$ and used $\pm -$ instead, e.g., $\cos (x \pm y) = \cos x \cos y \pm (- \sin x \sin y)$.