Revision history of "Focus"
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How to Cite This Entry:
Focus. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Focus&oldid=46948
Focus. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Focus&oldid=46948
This article was adapted from an original article by A.F. Andreev (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article