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By default, TEXT1 establishes a 9 point font for math mode superscripts,
and a 7 point font for math mode supersuperscripts. This is the value of
\mathdefault. You can establish other math mode font combinations than 9/7
by using the \selectmathset markup.
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You can establish a larger math set called \bigmath which can be used for
display math and you can switch back to \mathdefault for the text math.
