Different types of Blackboard Bold in the same document

Question

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?

Answer 1

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.

Answer 2

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