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  1. notation - What does "∈" mean? - Mathematics Stack Exchange

    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 …

  2. Difference between "≈", "≃", and "≅" - Mathematics Stack Exchange

    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 …

  3. What is the meaning of ⊊? - Mathematics Stack Exchange

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

  4. notation - what does ≼ or ≺ mean? - Mathematics Stack Exchange

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

  5. The meaning of various equality symbols - Mathematics Stack …

    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 …

  6. notation - What's the difference between "≡" and "≣"?

    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 …

  7. What is ≡ operator used for in math?

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

  8. notation - What does := mean? - Mathematics Stack Exchange

    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 …

  9. Much less than, what does that mean? - Mathematics Stack …

    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 …

  10. What precisely is a vacuous truth? - Mathematics Stack Exchange

    $\begingroup$ @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 …

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