How do I insert math to a post?

[KorvusKoraks]

I can't see a button for that anywhere :(

So that for example in 1/2 the "/" would be a horizontal line.

 

[Borg]

I can't see a button for that anywhere :(

So that for example in 1/2 the "/" would be a horizontal line.

There's no button. It's LaTeX. Have a look at the LaTeX Primer.

 

[BvU]

You use $\LaTeX$, for which see the guidelines: (point 6)

($\TeX$ commercial:)

It's so easy ! just put $or around the expression to get$LaTeX$. So (aB/2)t^2 + vB(initial)*t - vA(initial)*t + xBi = 0 becomes (aB/2)t^2 + vB(initial)*t - vA(initial)*t + xBi = 0 Then: superscripts come with ^ and subscripts with _ and grouping goes with curly brackets {...} You learn from other posts with a right-click on the formula and picking Show Math as ...$\TeX$commands. For your question: \frac {a+2} {b} gives$ \frac {a+2} {b} $and {1-2-3\over 4-5-6} gives${1-2-3\over 4-5-6} ##

[edit] by the way: ! And don't hesitate to post whatever. We are used to imperfection (we only strive for perfecetion )

[edit] perfection (unintended, but fortunate typo -- I like having it there )

 

[fresh_42]

I can't see a button for that anywhere :(

So that for example in 1/2 the "/" would be a horizontal line.

It would be $\text{$\frac{1}{2}$}$ or ##\text{$\frac{1}{2}$}## or ½ with the usage of the symbols you may use after clicking on ∑ in the editor window.

See also:
https://www.physicsforums.com/help/latexhelp/
http://detexify.kirelabs.org/symbols.html
https://www.sharelatex.com/learn/Spacing_in_math_mode

 

[KorvusKoraks]

There's no button. It's LaTeX. Have a look at the LaTeX Primer.

You use $\LaTeX$, for which see the guidelines: (point 6)

($\TeX$ commercial:)

It's so easy ! just put $or around the expression to get$LaTeX$. So (aB/2)t^2 + vB(initial)*t - vA(initial)*t + xBi = 0 becomes (aB/2)t^2 + vB(initial)*t - vA(initial)*t + xBi = 0 Then: superscripts come with ^ and subscripts with _ and grouping goes with curly brackets {...} You learn from other posts with a right-click on the formula and picking Show Math as ...$\TeX$commands. For your question: \frac {a+2} {b} gives$ \frac {a+2} {b} $and {1-2-3\over 4-5-6} gives${1-2-3\over 4-5-6} ##

[edit] by the way: ! And don't hesitate to post whatever. We are used to imperfection (we only strive for perfecetion )

It would be $\text{$\frac{1}{2}$}$ or ##\text{$\frac{1}{2}$}## or ½ with the usage of the symbols you may use after clicking on ∑ in the editor window.

See also:
https://www.physicsforums.com/help/latexhelp/
http://detexify.kirelabs.org/symbols.html
https://www.sharelatex.com/learn/Spacing_in_math_mode

Thanks a lot to everyone for the info! I have used LaTeX before, I'll have to try to recall how to use it...