LaTeX symbols for does not divide and is not congruent to

[fresh_42]

I've tried to figure it out but did not find them:
Does anybody know how to code the symbols of "does not divide" = "not |" and "is not congruent to" = "not ≡" in LaTex?
Thanks for reading.

 

[mfb]

$$x\nmid y$$
$$a \not\equiv b$$
Most (!) google hits for "latex does not divide" and "latex not congruent symbol" describe those symbols.

 

[fresh_42]

$$x\nmid y$$
$$a \not\equiv b$$
Most (!) google hits for "latex does not divide" and "latex not congruent symbol" describe those symbols.

Thank you. I've just read several pdf and the guide here. I should have found that solution by myself.

 

[DrClaude]

Check out Detexify.