Text Formatting ⇒ Space after command

[Laurentius]

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\def\a{a}
\a b

results in "ab"; can I make an \a such that

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\a b

results in "a b"?

[Stefan Kottwitz]

You could define

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\def\a{a\ }

or

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\def\a{a\space}

or, if you don't want the space before punctuation

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\usepackage{xspace}
\def\a{a\xspace}

Stefan