# Questions tagged [notation]

Question on the meaning, history, and usage of mathematical symbols and notation. Please remember to mention where (book, paper, webpage, etc.) you encountered any mathematical notation you are asking about.

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### Conventional notation for congruence to multiple numbers

Is there a more concise notation for the following sentence? "Thus $f(n) \equiv 0 \pmod{12}$ for all $n \equiv x \pmod{12}$ where $x \in \{ 0, 1, 3, 6, 7, 11\}$." Is this an acceptable ...
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### As $a \in\left\{ 1,2,3 \right\}~~$ is held, can I write $f(a=1)=k~~$ rather than $\text{As}~a=1, f(a)=f(1)=k~~$?

$$x \in\left\{1,2,3\right\}$$ $$f(x):=\text{function which returns certain value depending on argument }x$$ Assume the below statements . $$\text{As }x=1 ~,~$$ $$f(x)=f(1)=k$$ Can I write ...
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### Notation for pdf of normal distribution [closed]

Suppose I want to notate "the density of normal probability distribution with mean $\mu$ and standard deviation $\sigma$ computed for value $x$", is there a commonly accepted way to notate ...
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### What is this stylish R-like symbol?

What is that stylish R-like symbol at the end of the statement? I combed the lists of linear algebra symbols from almost every source online. Some guesses were Row space (which might make sense, just ...
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### What is meant by binding strength of binary operators?

Dr Frederic P. Scheuller writes at 33:55 of this video the decreasing order of binding strength in the sequence: $$\neg, \wedge , \lor , \implies, \iff$$ But what does it mean for binary operators to ...
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### Can ℜ be used instead of ℝ to represent a real coordinate space? If not, what alternatives are commonly used?

When going through logistic regression I was writing some documentation using classic troff and eqn UNIX tools. In logistic ...
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I am confused. Please, could you help me with this notation $$\exists x_{\delta, \varepsilon}$$ And if possible with some example.
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### Making a sequence non-recursive

I have a sequence that produces outputs: 1, 4, 13, 40, 121... I know that for the nth term, the output would be $3^0 + 3^1 + \ldots + 3^n$ But I don't know how to write this without it being recursive....
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### Correct notation for the CDF of a uniform distribution

I have a random variable, $x$, distributed uniformly on $[0,\frac{4}{3}]$. The probability that $x$ is greater than some $a\in \mathbb{R}$ is, of course, given by $(1-0.75(a))$. I want the value of ...