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When typesetting adjacent glyphs from typefaces of different slants, the space between them may require adjustment.
Apply an italic correction:
modify the spacing of the preceding glyph
so that the distance between it and the following glyph
is correct if the latter is of upright shape.
For example,
if an italic ‘f’ is followed immediately
by a roman right parenthesis,
then in many fonts the top right portion of the ‘f’
overlaps the top of the right parenthesis,
which is ugly.
Use
\/
whenever a slanted glyph
is followed immediately by an upright glyph
without any intervening space.
Apply a left italic correction:
modify the spacing of the following glyph
so that the distance between it and the preceding glyph
is correct if the latter is of upright shape.
For example,
if a roman left parenthesis is immediately followed
by an italic ‘f’,
then in many fonts the bottom left portion of the ‘f’
overlaps the bottom of the left parenthesis,
which is ugly.
Use
\,
whenever an upright glyph
is followed immediately by a slanted glyph
without any intervening space.