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notation - What does := mean? - Mathematics Stack Exchange 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
Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange 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
Does not necessarily equal symbol - Mathematics Stack Exchange Note, IF you do such a thing, make SURE that the expression and it's symbol is LOGICAL, WELL NAMED, and EXPLAINED, and post the symbol with name and explanation the correct instance: How to propose new notation, which I do not have to say to you, but just to be sure, to be on the safe side, I will do this either way If only because one, though
notation - What does ∈ mean? - Mathematics Stack Exchange 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"
Is there a mathematical sign for or? - Mathematics Stack Exchange The logical "or" is $\vee$; however, unless you are doing mathematical logic like set theory, that symbol is not widely used, because it is usually unnecessary and the work required to understand it outweighs its potential use time saving
notation - What is the symbol ≙ most commonly used for in a . . . What is the symbol ≙ most commonly used for in a mathematical or math-related context? LaTeX produces the symbol with \hateq The symbol has Unicode codepoint U+2259 The respective Unicode code chart shows it with the name ESTIMATES and the annotation = corresponds to Note that the names and annotations there are often not helpful
notation - Whats the difference between ≡ and ≣? - Mathematics . . . $\begingroup$ $\equiv$ and similar variations are a generic symbols used to notate an equivalence relation $=$ is the specific equivalence relation "equals" that we are used to with sets and natural numbers and by extension is also the symbol used for equality of rational, real, complex numbers etc