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By default, the “large” maths symbols stay at the same size
regardless of the font size of the text of the document. There’s good
reason for this: the cmex
fonts aren’t really designed to
scale, so that TeX’s maths placement algorithms don’t perform as
well as they might when the fonts are scaled.
However, this behaviour confounds user expectations, and can lead to
slightly odd-looking documents. If you want the fonts to scale,
despite the warning above, use the exscale
package — just
loading it is enough.
- Part of the LaTeX distribution.
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URL for this question: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=exscale
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This is FAQ version 3.26, released on 2013-02-25.