notation - What does := mean? - Mathematics Stack Exchange
2011年3月18日 · $\begingroup$ 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 happened a number of times), but := is so far the only easily typable symbol mentioned here, so it is perfectly reasonable to assume it stems from programming languages in the first place.
Difference between "≈", "≃", and "≅" - Mathematics Stack Exchange
For a closer similarity "≃" might mean a triangle almost congruent but only ROUGHLY similar, such as two triangles 3/4/5 and 3.1/4.1/5.1 while "≅" means congruent. Real life triangles use approximations and have rounding errors. 3/4 does not equal 3.1/4.1 but could be rough approximations for something already constructed.
What does the function f: x ↦ y mean? - Mathematics Stack …
2016年4月20日 · So, $↦$ is really just the math operator/binder $λ$, in disguise. Thus, one might just as well write $(x ↦ x^2)(3) = 3^2 = 9$ , denoting the function directly rather than through a level of indirection.
notation - What does "∈" mean? - Mathematics Stack Exchange
2014年6月25日 · The expressions "A includes x" and "A contains x" are also used to mean set membership, however some authors use them to mean instead "x is a subset of A". 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.
What is the meaning of ⊊? - Mathematics Stack Exchange
2020年12月22日 · 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 gathered. Is ⊊ a sort of ≤ or < but for subsets? What would that little crossing line mean? I have tried looking it up on the net but could not find an answer. Thank you.
what does ∇ (upside down triangle) symbol mean in this problem
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Much less than, what does that mean? - Mathematics Stack …
2015年11月7日 · What exactly does $\ll$ mean? I am familiar that this symbol means much less than. ...but what exactly does "much less than" mean? (Or the corollary, $\gg$) On Wikipedia, the example they use is that $1\ll 9999999999$ But my thought on that is that $10^{10^{10^{11}}}\ll 10^{10^{10^{11}}}+9999999999$, based on the same logic. But I am confused ...
What does the $\\wedge$-symbol mean in academic papers?
2019年1月5日 · You can notice the similarity both in form and meaning with $\cap$ and $\cup$ from set theory. In differential geometry, $\omega_1\wedge\omega_2$ also means the wedge product of two differential forms.
notation - What do Subscripted numbers in an equation mean ...
$\begingroup$ @Brian M. Scott What does it mean when each subscript is non-numerical, and is exactly the same? I have an equation that has a value T (temperature in Kelvin), subscripted gamma. It's used several times each the same way, no variation, and all other equations in the same family simply use T, unsubscripted. What might that mean ...
Mathematical Notation - Arrow Sign - Mathematics Stack Exchange
$\begingroup$ The syntactic ambiguity is important, in my view amounting to slightly worse than ‹poor grammar› but possibly actually faulty semantics (failing to convey intended meaning while also plus valid). Reading the OPost as is (without justification), I would take it to be the weaker claim (i.e., the chain of implications, rather ...