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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Sharp as mathematics****From**:*mdoob@CC.UManitoba.CA***Date**: Mon, 9 Aug 93 11:19:40 CDT

> can people give me examples of the musical sharp sign used in math > documents Sometimes $f^\sharp$ will be used to in categorical constructions derived >from a morphism $f$. I can probably hunt up a real live example if it is important. The hash mark # (this is the thing above the three on my keyboard; is it still an octothorpe after crossing the Atlantic?) is, of course, very commonly used for set cardinality. It is called the pound symbol in North America (don't blame me; I'm just the messanger). I've never seen the currency symbol used in mathematics. It has become common to used something like $K_{i=1}^\infty$ for continued fractions. Cheers, Michael

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