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https://tex.stackexchange.com/questions/3492/how-do-i-make-a-blackboard-1
https://en.wikipedia.org/wiki/Blackboard_bold
https://www.quora.com/Mathematics-What-does-a-blackboard-bold-1-mean
http://latex.org/forum/viewtopic.php?t=17427
https://stackoverflow.com/questions/43886576/how-to-do-a-bold-1-mathbbm1-in-mathjax/43888572
https://oeis.org/wiki/Blackboard_bold
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https://www.douglas.stebila.ca/blog/archives/2004/06/27/latex-blackboard-bold-1/
https://www.w3.org/TR/xml-entity-names/double-struck.html
https://nl.mathworks.com/matlabcentral/answers/24790-latex-interpreter-and-blackboard-bold-mathbb-for-text
https://www.officetooltips.com/word_2016/tips/how_to_quickly_insert_double_strike_or_blackboard_bold_symbols_in_word_equations.html