T H E E L E M E N T S |
Book I Proposition 19 | |
For, if not, AC is either equal to AB or less. Now AC is not equal to AB, for then the angle ABC would also have been equal to the angle ACB; [1.5] but it is not; Neither is AC less than AB, for then the angle ABC would also have been less than the angle ACB; [1.18] but it is not; |
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