# Tag Info

## Hot answers tagged notation

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### What does $\cos \operatorname{am}$ mean?

It's the Jacobi amplitude. See https://en.wikipedia.org/wiki/Jacobi_elliptic_functions#Definition_in_terms_of_inverses_of_elliptic_integrals
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### What does $\mathbb{N}_n$ mean?

It is the set of the first $n$ natural numbers. But please note that different places have different conventions, regarding whether $0$ is included, or whether $n$ is included. In simplicial homotopy ...
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### How to write property for every element in a set

(1st paragraph originally a comment) It would help to explain why you feel that you need to restate this straightforward statement in mathy symbolic form. For instance, are you trying to analyze ...
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### Confusion using function composition

I assume that the confusion is arising in the following line from the linked answer: Since $h(t)=\sqrt t$, you have $g(t)=\cos(h(t)^2)$, [...] You are trying to find $g$ as a function of $h$, where ...
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1 vote
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### How to denote domain and range of a function that substitutes a given interval?

How about something like: We write $I_c$ to denote the set of closed intervals $[a,b] \subset \mathbb{R}$ where $a,b \in \mathbb{R}$ and $a \leq b$. Consider a function $f:I_c \rightarrow I_c$ defined ...
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### Math Operators with Changing Sub-Properties?

This isn't a thing in mathematics. In math, we use side-effect-free operations. To properly reason about things, any statements about them need to remain true; if we declare that $2\mathrel{Ϡ}2 = 6$, ...
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### What is the meaning of "$m$" and "$2$" in "$m \angle GLI = 2 m \angle GLH$"?

The m means the angle is congruent or of having equal length or measure right? Generally, it does: $m \angle A$ typically means "the measure of angle $A$", and $m \angle ABC$ would mean &...
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### How is a cone most often (or by convention) notated to show its exact shape?

The circular cone given ( base radius, height) is commonly and fully understood. Respectively with the above $(r,h)$ are derived slant height slope angle ( generator angle ) a.k.a. the semi vertical ...
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### Notation for "the sum of column elements in a in the upper triangle of a matrix for a given row"

Well, the standard way to write this would be $$\text{Upper Row Sum}_i(A) = \sum_{j=i}^n A_{i,j}$$ Are you looking for something more compact than this?
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