Index 469 Wallis, John, 324 Wantzel, Pierre, 316, 319 weak angle-sum postulate, 333 weak extreme point, 174 well defined, 428 well-ordering principle, 438 whole is greater than the part angle, 90 converse, 73, 97 in Euclid’s Elements, 4 segment, 66 X-lemma, 79 Y-lemma, 78 zero angle, 84
Previous Page Next Page