Questions tagged [notation]
Questions 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.
13,195 questions
-1 votes
0 answers
35 views
Formalizing Behavioral Stability: A Proposed Model ($LE = R \cdot (L \oplus Lu) \implies \sigma_{\infty}$) [closed]
I have been working for 45 years on observing empirical human dynamics and collaborative systems. I am seeking to formalize a "Logic of Exploitation" ($LE$) intended for behavioral auto-...
4 votes
1 answer
140 views
What would be a better notation for the independence/clique number of a graph?
I hate graph theoretical notations. They follow no discernible pattern and are confusing as hell. Pretty much every Greek letter have one (or several) graph invariant associated to it$^\star$. I want ...
2 votes
2 answers
196 views
Outer Product Notation Generalisation
I want to generalise the outer product as a pedagogical bridge to multilinear algebra (without jumping straight into the abstract formalisms), and eventually demonstrating the limitations of the ...
5 votes
0 answers
160 views
Is the old radian symbol (a superscript "c") now defunct?
At school in 1975, we were introduced to measuring angles in radians. The symbol used then was a sort of small c written as a superscript, e.g. as in the expression below $$ \theta \; = \; \dfrac{\pi}{...
1 vote
0 answers
88 views
How to rewrite this probability equation?
Here is the original equation I am dealing with - I am having difficulty trying to understand it. Specifically, the subscripts (i.e. $t+1|I_t$ and $Y_1|I_0$ ) on both sides confuse me: $$f_{Y_{t+1}|...
7 votes
2 answers
741 views
The meaning of the symbol $A^{-\prime-\prime}$, where $A$ is a set
This page is from Measure and category by John C. Oxtoby page 20. What is the meaning of this symbol? I added a red line under it. There is no definition of this symbol in this book, so I couldn't ...
7 votes
1 answer
205 views
Sets, indexed sets, sequences, or families — what is the right object for linear (in)dependence?
When studying linear algebra, I have noticed that different authors use different mathematical objects when defining linear dependence and independence, and I am trying to understand whether these ...
4 votes
2 answers
564 views
Trying to figure out a function in set theory formally
I was playing around with a function in set theory, and I came out with this function : $S(\emptyset) = \lbrace\emptyset \rbrace $ $S(S(\emptyset)) = \lbrace \emptyset, \lbrace\emptyset \rbrace \...
0 votes
0 answers
136 views
Can you do an integral with a partial differential?
Just a quick question here, is it common to or does it make any sense to integrate using a partial derivative $\partial x$ rather than just $dx$? Like this: $$\int f(x,y)\partial x$$ I would guess ...
3 votes
0 answers
37 views
Is there standard notation for forming a subobject of $X$ based on a closed term of type $PX$?
Recently, I've been working on a presentation of some of the basics of topos theory using internal language (current draft here). One thing I've run across there is that I frequently need to take a ...
1 vote
2 answers
48 views
Correct Interpretation of Equations with Indices
This is a doubt that arose while studying the tensor product representation of lie algebra. The normalization condition for the generators in any given representation is written as : $$\langle T_{a}|...
2 votes
0 answers
148 views
Ambiguous notation: $\left|\frac{\mathrm d}{\mathrm dt}\vec{r}(g(0))\right|$ [closed]
I got a simple math problem but I find the notation confusing. How do you interpret the question? \begin{aligned} & \text{zij } \vec{r}:\mathbb{R}\to\mathbb{R}^3\text{ gegeven door} \\ & &...
1 vote
2 answers
178 views
What does the notation $[f(T)]_\beta^\gamma$ mean?
I am using Linear Algebra by Arnold Insel, Lawrence E. Spence, and Stephen H. Friedberg. Definition. Let $β = \{u_1, u_2,...,u_n\}$ be an ordered basis for a finite dimensional vector space $V.$ For $...
3 votes
0 answers
79 views
Notation meaning for $\mathcal{F}_n\uparrow \mathcal{F}$ where $\mathcal{F}_n$ and $\mathcal{F}$ are $\sigma$-fields
Suppose that $\mathcal{F}_n$ are sub-$\sigma$-fields of a $\sigma$-field $\mathcal{F}$, one of the assignment problems in a probability class asks us to show that if $\mathcal{F}_n\uparrow\mathcal{F}$ ...
4 votes
2 answers
216 views
Should I write $\mathrm{i}$ or $i$? Should I write $\mathrm{e}$ or $e$? [closed]
I apologize in advance if the question is too soft! I have always been used (and now don't even recall how it started) to denote the unitary imaginary by $\mathrm{i}$ and the Napier constant by $\...