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  1. 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. …

  2. Is there a closed form expression for the infinity symbol?

    May 11, 2015 · I was looking for a closed form expression which plots the infinity symbol.

  3. Notation for rounding in equation - Mathematics Stack Exchange

    I'm wondering if there is a symbol or notation for Round to the nearest 10th For example, the area of a circle with a radius of 45 feet, rounded to the nearest square foot, could be written as, A =...

  4. Implies ($\Rightarrow$) vs. Entails ($\models$) vs. Provable …

    Consider A $\\Rightarrow$ B, A $\\models$ B, and A $\\vdash$ B. What are some examples contrasting their proper use? For example, give A and B such that A $\\models$ B is true but A …

  5. What is the difference between plus-minus and minus-plus?

    Possible Duplicate: What is the purpose of the $\\mp$ symbol in mathematical usage? Just as the title explains. I've seen my professor actually differentiating between those two. Do they not …

  6. Are There Any Symbols for Contradictions? - Mathematics Stack …

    Perhaps, this question has been answered already but I am not aware of any existing answer. Is there any international icon or symbol for showing Contradiction or reaching a contradiction in …

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

    Suppose (E, ≤) and (F, ≼) are isomorphic well-orderings. Then there exists a unique isomorphism for (E, ≤) to (F, ≼). I've been scouring the internet for what this symbol means. Someone said …

  8. differential geometry - Prove that Christoffel symbols …

    It is known that the transformation rule when you change coordinate frames of the Christoffel symbol is: $$ \\tilde \\Gamma^{\\mu}_{\\nu\\kappa} = {\\partial \\tilde ...

  9. reference request - What are usual notations for surjective, …

    Update: In the category of sets, an epimorphism is a surjective map and a monomorphism is an injective map. As is mentioned in the morphisms question, the usual notation is …

  10. Symbols for "odd" and "even" - Mathematics Stack Exchange

    Nov 26, 2014 · 0 We could write even number symbol as it’s abbreviation, that is e-n. Similarly for odd number, we could write o-n.