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In mathematical mode you can change the typefaces of the fonts when needed. For instance, it's customary to represent real numbers with a blackboard bold font, or topological spaces with calligraphic font. This article shows several fonts in math mode.



For some elements is convenient to have the possibility of changing the font typeface.

Let \( \mathcal{T} \) be a topological space, a basis is defined as
 \mathcal{B} = \{B_{\alpha} \in \mathcal{T}\, |\,  U = \bigcup B_{\alpha} \forall U \in \mathcal{T} \}

Several fonts require to add the line \usepackage{amssymb} to the preamble to work.

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Capital letters-only font typefaces

There are some font typefaces that support a limited number of characters, these fonts usually denote some special sets.

\mathcal{RQSZ} \\
\mathfrak{RQSZ} \\

This example shows Calligraphic, Fraktur and Blackboard bold typefaces. For instance, to display the R in blackboard bold typeface \mathbb{R} will do the trick.

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Other mathematical fonts

It's possible to set a different font family for a complete mathematical expression.

3x^2 \in R \subset Q \\
\mathnormal{3x^2 \in R \subset Q} \\
\mathrm{3x^2 \in R \subset Q} \\
\mathit{3x^2 \in R \subset Q} \\
\mathbf{3x^2 \in R \subset Q} \\
\mathsf{3x^2 \in R \subset Q} \\
\mathtt{3x^2 \in R \subset Q} 

In this cases not only letters but all characters change its appearance, for example \mathit{3x^2} displays the equation italicised.

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Further reading

For more information see