Mark Krein
= Mark Krein
{c}
{title2=1907-1989}
= Mark Grigorievich Krein
{c}
{synonym}
= M. G. Krein
{c}
{synonym}
https://mathshistory.st-andrews.ac.uk/Biographies/Krein/
\Image[https://mathshistory.st-andrews.ac.uk/Biographies/Krein/Krein.jpeg]
{title=Portrait of <Mark Krein>}
{width=240}