About

A font, in TeX terminology, is one that is sloped from the vertical, but the letters in the font have the same shape as the ordinary .

differs from most noticeably in letters like "a", "f", "g"; the details differ in different type families. Slanted type is obtained in LaTeX with the commands \textsl{...} or {\slshape ...}.

Since italic is traditionally used for math variables, Donald Knuth created slanted fonts in the Computer Modern family to be used in theorems and similar environments which are normally emphasized so that math notation would be easy to distinguish from the surrounding text.

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