# Different types of Blackboard Bold in the same document

I am using mtpro2 package and it has 7 (!) different options for the Blackboard Bold (BB) to choose from. However only 2 of them provide BB version of Greek letters. And in both cases the result is italic which hurts the eyes when it comes to \mathbb{N, Z, Q, R} and \mathbb{C}.

I was wondering is there a way to have two sets on the same document, maybe with a new command for the Greek letters?

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Try \let\mathbblatin\mathbb after \usepackage{amssymb}, but before \usepackage{mtpro2}, and then \mathbblatin{N} in your document. This should give you the AMS blackboard bold N. Does it work? –  Hendrik Vogt Jun 22 '12 at 6:56
It had no effect. Blackboard bold N appears as before ... –  Hesam Jun 22 '12 at 11:34
Have you looked into the mathalfa package and its capabilities of having various math alphabets side by side? –  Mico Jun 26 '12 at 2:11
Yes, but it lets you set only one mathbb font and none of the options have Blackboard bold for Greek alphabet. –  Hesam Jun 26 '12 at 22:09
I don't have access to mtpro2 to test it, but @Hendrik Vogt's suggestion works for me substituting mathpazo for mtpro2. What does \show\mathbb give after loading mtpro2? Or \expandafter\show\csname mathbb \endcsname if it's protected. –  Ivan Andrus Jul 2 '12 at 11:54

Try \let\mathbblatin\mathbb after \usepackage{amssymb}, but before \usepackage{mtpro2}.

Then \mathbblatin{N} in your document. This should give you the AMS blackboard bold N.

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amssymb and mtpro2 can not be loaded together, so I actually would like to delete your answer. OK? –  mafp Dec 29 '12 at 15:48

amssymb and mtpro2 can not be loaded together.

To use two different blackboard bold alphabets in your document, proceed as follows:

\documentclass{article}

\usepackage[mtpbb]{mtpro2}  %% to have Times-compatible Blackboard Bold as \mathbb

% \DeclareMathAlphabet{\mathbbgr}{U}{mt2bb}{m}{it}  %% to have Times-compatible Blackboard Bold Italic as \mathbbgr
\DeclareMathAlphabet{\mathbbgr}{U}{mt2hrb}{m}{it}  %% to have Times-compatible Holey Roman Bold Italic as \mathbbgr

\begin{document}

\begin{displaymath}
\mathbb{NZQRC} \mbox{ versus } \mathbbgr{NZQRC \alpha\Gamma}
\end{displaymath}

\end{document}


to obtain

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