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How to look up a symbol?
Why can I only use some capital greek letters inside my equations?

I want to use the big rho (\Rho) in my document but can not find a package which provides that char. It is not in the default math package.

Is there a package with extended greek letters? Like here: http://en.wikibooks.org/wiki/LaTeX/Mathematics#List_of_Mathematical_Symbols

marked as duplicate by clemens, Werner, ienissei, Mensch, Martin Schröder Dec 6 '12 at 22:35

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  • 5
    Big rho looks like a capital "P"… – Seamus Mar 27 '12 at 8:53
  • 2
    How about: \def\Rho{P} – Seamus Mar 27 '12 at 8:57
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  • @percusse: That's a good idea. I'd suggest just mentioning the link in a comment then ("This question might be interesting to you if you're looking for a specific symbol ..."), unless it actually is a duplicate. – doncherry Mar 27 '12 at 9:29
  • 2
    Available greek capitals are \Gamma,\Lambda,\Sigma,\Psi,\Delta,\Xi,\Upsilon,\Omega,\Theta,\Pi,\Phi the rest is, as far as I know, the same with the Latin capitals. However for a more comprehensive look-up options for other specific symbols please see How to look up a symbol?. – percusse Mar 27 '12 at 9:34

As @Seamus correctly points out, capital Rho has the same glyph as capital P. You can put \newcommand{\Rho}{\mathrm{P}} into your preamble to make the macro \Rho avialable. The usage of \mathrm is necessary if you use default math alphabets, because all greek capitals are typeset in up-right font.

List of those Greek letters whose capital variants coincide with latin capitals:

Α α alpha
Β β beta
Ε ε epsilon
Ζ ζ zeta
Η η eta
Ι ι iota
Κ κ kappa
Μ μ mu
Ν ν nu
Ο ο omicron
Ρ ρ rho
Τ τ tau
Υ υ upsilon
Χ χ chi

Plus remember that lowercase omicron looks exactly like o (and should be typeset by normal math font, i.e., without \mathrm).

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