{blackboard} is about the particular "double-stroke" font used, for example, to denote the sets of natural, rational, and real numbers in mathematics

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Cyrillic blackboard bold

Is there a way to produce blackboard bold Cyrillic letter? (I know I can do Greek letters with mathbbol, but I need $\mathbb{Л}$.)
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Mathbbold in Beamer

I am trying to write a beamer presentation, but I can't use the mathbbold package. Here is the code I wrote: \documentclass[pdf] {beamer} \mode<presentation> \makeatletter %% preamble ...