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Title says it all. What's more common? Is there one to prefere (maybe due to some norm)?


$\operatorname{\mathfrak{R}} z, \operatorname{\mathfrak{I}} z$

or that:

$\operatorname{Re}z, \operatorname{Im}z$ ?

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It's not "fractal". It's "fraktur". Wikipedia. –  kahen Nov 10 '12 at 15:55
Thanks, corrected. –  Foo Bar Nov 10 '12 at 15:58
This is an opinion question which is hard to answer. My own sense is that the fraktur notation is a bit older and less common nowadays. –  Grumpy Parsnip Nov 10 '12 at 15:58
Because of Latex I'm actually here. I was wondering if there's a special reason why Latex defaults \Re and \Im to the Fraktur versions. –  Foo Bar Nov 10 '12 at 16:05
I see $\operatorname{Re}z, \operatorname{Im}z$ more often. –  moose Oct 29 '13 at 13:43

1 Answer 1

I lean towards readability and I find $\operatorname{Re}z$ and $\operatorname{Im}z$ unambiguously clear.

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Tastes vary, of course, but not being able to write or even recognize fraktur tends to favor readability. The fact that $\mathfrak{A}$ looks like an $U$, not an $A$, and $\mathfrak{P}$ looks like a $B$, not a $P$, has always slightly annoyed me. –  lhf Aug 24 at 11:10

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