How to write null set in latex

Empty set is also called null set. Mathematically, the Empty set is denoted by the Phi ø and curly brackets {}. However, the use of this {} symbol is very rare in the case of Empty sets. In most cases, these ø symbol are used. Latex has more than one command to denote both symbols.

To get {x|x is positive and even}, you can do: As raised in the comments - this relies on the amsmath package. Instead, you can do: For most purposes, this has the same effect, but there are minor differences: For really nice spacing, follow Hagen von Eitzen's advice and use: As you can see, \, inserts a thin space.

LaTeX Symbol LaTeX A{displaystyle mathrm {A} }and α{displaystyle alpha } Alphaand alpha N{displaystyle mathrm {N} }and ν{displaystyle nu } Nuand nu B{displaystyle mathrm {B} }and β{displaystyle beta } Betaand beta Ξ{displaystyle Xi }and ξ{displaystyle xi } Xiand xi Γ{displaystyle Gamma }and γ{displaystyle gamma }

I find that { } ( \ {\} in LateX) is perfectly clear to mathematicians, maybe not to computer scientists. I would use the following: The \diameter is an alternative for emptyset in lines, it is a bit tiny. Thanks for contributing an answer to TeX - LaTeX Stack Exchange!