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<p>Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
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<br>Subjects: equations; block; determinant; evanescent; values; variables; equation; arbitrary; intersect; set; arbitrary values; principal minors; square block; principal minor; points lie; remaining equations; systematic equation; planes intersect; oblong block; block formed</div>
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Charles Lutwidge Dodgson,  Lewis Carroll</div>
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