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 …

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

Dec 22, 2020 · I have encountered this when referencing subsets and vector subspaces. For example, T ⊊ span(S) should mean that T is smaller than span(S)--at least from what I've …

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 …

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 …

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 …

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

Apr 20, 2016 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …

May 2, 2015 · Meaning of そのままじゃない？ in this context Sheet Music Analysis and Comparison Typesetting ...

Oct 31, 2017 · I'm doing a research report, and I need to determine a companies assets. So I found their annual report online, and for the assets, it says (in thousands).