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Books Books 1 - 2 of 2 on Frend's papers, and dated November 16, 1801, distinctly lays it down that, in these....  
" Frend's papers, and dated November 16, 1801, distinctly lays it down that, in these matters, it is not the principles which prove the conclusions, but the truth of the conclusions which proves that there must, somewhere or other, be principles. " Whether... "
Trigonometry and Double Algebra - Page 41
by Augustus De Morgan - 1849 - 167 pages
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Monthly Notices of the Royal Astronomical ..., Volumes 4-6; Volumes 1836-1845

Astronomy - 1839
...conclusions which proves that there must, somewhere or other, be principles. " Whether or not," says he, " I have found a logic, by the rules of which operations...lead to right conclusions, they must have a logic." And he goes on thus : " Till the doctrines of negative and imaginary quantities are better taught than...
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The Christian reformer; or, Unitarian magazine and review [ed. by R. Aspland].

Robert Aspland - 1842
...conclusions which proves that there must, somewhere or other, be principles. " Whether or not," says he, " I have found a logic, by the rules of which operations...lead to right conclusions, they must have a logic." And he goes on thus : " Till the doctrines of negative and imaginary quantities are better taught than...
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