what does this sign means ?

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what does this sign means ?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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reversed A
|dw:1435770248432:dw|
for all

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Other answers:

\thread
like if you say \(\forall n\in {\bf R}\)
what is thread ?
that means for all real numbers n
for all, that is the meaning
questions?
Just my way to saying that @SolomonZelman had it all. No need to get replies from other users
ok tnx . it means (for all)
tnx:) I saw that sign once, never used it tho' because no one qould get it, although it is a good tool to save space.
would*
Is that from a tutorial of a person who is obsessed with notations?
I don't really se it used alot... in any case, you now know it:)
yep i m proud i know it
I clicked on spraguer that I saw just now, and glitched:D
\[\forall x\in\mathbb{R^+}~x\gt \sin x\]
is their any link that gives informtion on all mathmatical signs and its meaning
look up quantifiers
\(0>\sin 0\) ?
0 is not a positive real number
oh forget that \(\huge \mathbb{R^{\color{red}{+}}}\)
you may think of \(\forall \) as a for/foreach loop in a programming language
\[\forall x\in \color{red}{X} ~ ~ \color{blue}{\text{statement}}\] the \(\color{blue}{\text{statement}}\) is applicable to "all" the elements of set \(\color{red}{X}\)
i have also just seen reversed E |dw:1435771106226:dw|
ok i see that sign \(\forall\) is from set theory
i have seen as "there exist" written as it meaning
\(\exists\) refers to existence of at least one that satisfies the statement that follows
\[\exists x\in \mathbb{R}~:~x^2=2 \] means there exists at least one real number \(x\) "such that" the square of it equals 2
yes, lol, √2
or -√2
... ±√2
(i am using alt shortcuts)
can you guess what below statement means \[\large \not \exists x\in \mathbb{Q}~:~x^2=2 \]
what is \(\large \mathbb{Q}\) ?
"set" of rational numbers
there exists no rational numbers that satisfy \(x^2=2\)
Yes, thats same as saying \(\sqrt{2}\) is irrational
\(\not \exists \mathbb{GM}:\text{GM}:\text{stockfish6.0} ::1:0\) guess the statement
there doesn't exist a grandmaster who beat the stockfish 1-0
good one!
yep correct
it is important to mention stockfish version 6.0

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