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 …

The $\approx$ is used mostly in terms of numerical approximations, meaning that the values in questions are "close" to each other in whatever context one is working, and often it is less …

Dec 22, 2020 · What is the meaning of ⊊? Ask Question Asked 4 years, 5 months ago. Modified 4 years, 5 months ago.

Precise meaning of $\ll_{n, \varepsilon}$ in number theory paper. 2. Intuition behind order isomorphisms. 0.

May 6, 2015 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …

May 20, 2018 · $\begingroup$ $\equiv$ and similar variations are a generic symbols used to notate an equivalence relation. $=$ is the specific equivalence relation "equals" that we are …

It's used for various things in various contexts. The one about "defined to be equal" is often rendered as ":=".

Mar 18, 2011 · $\begingroup$ I was aware of Pascal using :=, but not the others.I think it is possible that the language designers of that time where influenced by maths (as has …

Nov 7, 2015 · It has no precise meaning. It's just a shorthand for saying "sufficiently small" or "easily seen to be so much smaller that the following argument will work" -- and shouldn't be …

$\begingroup$ @KennyLJ I see; what you there have is a not totally formal argument that $\emptyset \subseteq A$. $. If you want to formalize it (which in my opinion doesn't answer the …