William Frend 1757-1841
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I came across the following book: The principles of Algebra / William Frend.It contains the following:
Leaf inserted before title page: Negative quantities in Mr. French's handwriting, before his repudiation of them.
Manuscript notation on title page: Sophia Elizabeth [Frend] OO [i.e. married] Augustus De Morgan.
Both these bits of information are in the same handwriting.This volume is held in the library of University of Leicester, UK.