11 questions linked to/from Backwards epsilon
36 views

### notation in definition of range and domain [duplicate]

In my set theory book (A book of set theory, Charles,C,Pinter) domain and range of graph $G$ is defined by $dom G=\{x:\exists y \ni (x,y)\in G\}$ $ran G=\{y:\exists x \ni (x,y)\in G\}$ But I don't ...
85k views

### Symbol for “such that” (not in set)

If $A$ is a set, we can use the set notation $$A= \{ b \mid\text{property p_1 of b}\}$$ But say $A$ is an element like $b$, $$A = b \mid \text{property p_1 of b}$$ is this a usual ...
961 views

### Do people whose native languages are read right-to-left experience mathematical statements differently? [closed]

When I see the equation $$A = B$$ the first idea to occur to me is that $A$ can be transformed into $B$. Although of course $$B = A$$ has the same content, to me it connotes rather that $B$ can be ...
28k views

### What does the symbol described below mean? (looks like: sideway u with a line through the middle)

The symbol kind of looks like this: ε, but it's more like a sideways u with a line through the middle.
2k views

### Notation using “such that”

Is it correct to say "$a_t=\alpha:\alpha\in A_{\sigma}$" with the following meaning: $a_t$ is equal to $\alpha$ and $\alpha$ belongs to set $A_\sigma$.
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### Set-builder notation: is there another symbol for “such that”?

My teacher is teaching us about sets, and he said that the '|', the ':' and the '\' symbols can be used to mean 'such that'. I'm certain of the first two, but I searched a little and couldn't find ...
2k views

### Is using the “contains” symbol $\ni$ frowned upon?
I am currently taking discrete math, and we have been learning several math symbols that we have used in our proof-writing assignments. Obviously, we have discussed the $\in$ symbol for inclusion in a ...