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Heath T.L. (ed.) — The Thirteen Books of Euclid's Elements, Vol. 2 |
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Prime (number), different names for prime, “odd-times odd” (Theon), “linear” (Theon), “rectilinear” (Thymaridas), “euthymetric” (Iamblichus) 285
Prime (number), prime absolutely or in themselves as distinct from prime to one another (Theon) 285
Prime (number), “prime and incomposite ( )” 284
Proclus on absence of formal divisions of proposition in certain cases, e.g. IV. 10 100
Proclus on use of “quindecagon” for astronomy III 4 39 40 193 247 269
Proportion in giving older theory as well Euclid simply followed tradition 113
Proportion, alternatives for v. Def. 5 by a geometer-friend of Saccheri, by Faifofer, Ingrami, Veronese, Enriques and Amaldi 126
Proportion, Aristotle on general proof (new in his time) of theorem (alternando) in proportion 113
Proportion, complete theory applicable to incommensurables as well as commensurables is due to Eudoxus 112
Proportion, De Morgan on extension of meaning of ratio to cover incommensurables 118
Proportion, De Morgan’s defence of V. Def. 5 as necessary and sufficient 122—124
Proportion, definition in V. Def. 5 substituted for that of VII. Def. 20 because latter found inadequate, not vice versa 121
Proportion, extensive use of proportions in Greek geometry 187
Proportion, interpolated definitions of proportion as “sameness” or “similarity of ratios” 119
Proportion, old (Pythagorean) theory practically represented by arithmetical theory of Eucl. VII 113
Proportion, power of expressing incommensurable ratio is power of approximation without limit 119
Proportion, proportion in three terms (Aristotle makes it four) the “least” 131
Proportion, proportionals of VII. Def. 20 (numbers) a particular case of those of V. Def. 5 (Simson’s Props. C, D and notes) 126—129
Proportion, proportions enable any quadratic equation with real roots to be solved 187
Proportion, supposed use of propositions of Book V. in arithmetiPsellus 234
Proportion, three “proportions” 292, but proportion par excellence or primary is continuous or geometric 292—293
Proportion, V. Def. 5 corresponds to Weierstrass’ conception of number in general and to Dedekind’s theory of irrationals 124—126
Proportion, X. 5 as connecting two theories 113
Proportion, “continuous” proportion ( or , in Euclid ) 131 293
Proportion, “discrete” or “disjoined” ( ) 131 293
Proportion, “ordered” proportion ( ), interpolated definition of 137
Proportion, “perturbed” proportion ( ) 136 176—177
Ptolemy, Claudius 111 117 119
Ptolemy, Claudius, lemma about quadrilateral in circle (Simson’s VI. Prop. D) 225—227
Pyramidal numbers 290
Pyramidal numbers, pyramids truncated, twice-truncated etc. 291
Pythagoras construction of figure equal to one and similar to another rectilineal figure 254
Pythagoras introduced “the most perfect proportion in four terms and specially called “harmonic”” into Greece 112
Pythagoras, reputed discoverer of construction of five regular solids 97
Pythagoreans called 10 “perfect” 294
Pythagoreans distinguished three sorts of means, arithmetic, geometric, harmonic 112
Pythagoreans had theory of proportion applicable to commensurables only 112
Pythagoreans of even and odd 281
Pythagoreans theorem about only three regular polygons filling space round a point 98
Pythagoreans, 7/5 as approximation to 119
Pythagoreans, construction of dodecahedron in sphere 97
Pythagoreans, construction of isosceles triangle of IV. 10 and of regular pentagon due to 97—98
Pythagoreans, definitions of unit 279
Pythagoreans, possible method of discovery of latter 97—99
Quadratic equations exact correspondence of geometrical to algebraical solution 263—264 266—267
Quadratic equations, or condition of possibility of solving equation of Eucl. VI. 28 259
Quadratic equations, but method gives both roots if real 258
Quadratic equations, one solution only given, for obvious reasons 260 264 267
Quadratic equations, solution by means of proportions 187 263—265 266—267:
Quadrilateral condition for inscribing circle in 93 95
Quadrilateral in circle, Ptolemy’s lemma on (Simson’s VI. Prop. D) 225—227
Quadrilateral inscribing in circle of quadrilateral equiangular to another 91—92
quadrilateral not a “polygon” 239
Radius, no Greek word for 2
Ratio ex aequali 136
Ratio ex aequali in perturbed proportion 136
Ratio, alternate ratio, alternando 134
Ratio, arguments about greater and less ratios unsafe unless they go back to original definitions (Simson on V. 10) 156—157
Ratio, Barrow’s defence of it 117
Ratio, composition of ratio, componendo, different from compounding ratios 134—135
Ratio, compound ratio 132—133 189—190 234
Ratio, conversion of ratio, convertendo 135
Ratio, def. of greater ratio only one criterion (there are others) 130
Ratio, definition of 116—119 110
Ratio, division of ratios used in Data as general method alternative to compounding 249—250
Ratio, duplicate, triplicate etc. ratio as distinct from double, triple etc 133
Ratio, inverse ratio, inversely 134
Ratio, means of expressing ratio of incommensurables is by approximation to any degree of accuracy 119
Ratio, method of transition from arithmetical to more general sense covering incommensurables 118
Ratio, names for particular arithmetReciprocal or reciprocally related figures: definition spurious 189
Ratio, operation of compounding ratios 234
Ratio, separation of ratio, separando (commonly dividendo) 135
Ratio, sufficient ground for regarding it as spurious 117
Ratio, test for greater ratio easier to apply than that for equal ratio 129—130
Ratio, tests for greater equal and less ratios mutually exclusive 130—131
Ratio, “ratio compounded of their sides” (careless expression) 248
Reductio ad absurdum, the only possible method of proving III. 1 8
Saccheri, Gerolamo 126 130
Saccheri, Gerolamo, proof of existence of fourth proportional by VI. 1, 2, 12 170
Savile, H. 190
Scalene, a class of solid numbers 290
Scholia, IV. No. 2 ascribes Book IV. to Pythagoreans 97
| Scholia, V. No. 1 attributes Book V. to Eudoxus 112
Scholiast to Clouds of Aristophanes 99
Sectio canonis of Euclid 295
Sector (of circle), explanation of name, two kinds (1) with vertex at centre, (2) with vertex at circumference 5
Sector-like (figure) 5
Sector-like (figure), bisection of such a figure by straight line 5
Segment of circle, angle of 4
Segment of circle, similar segments 5
Semicircle, angle of 4 39—41 see
Semicircle, angle of, angle in semicircle a right angle, pre-Euclidean proof 63
Separation of ratio, , and separando ( ) 135
Separation of ratio, , and separando ( ), separando and componendo used relatively to one another, not to original ratio 168 170
Sides of plane and solid numbers 287—288
Similar plane and solid numbers 293
Similar plane and solid numbers, one mean between two similar plane numbers 371—372
Similar plane and solid numbers, two means between two similar solid numbers 294 373—375
Similar rectilineal figures, def. gives at once too little and too much 188
Similar rectilineal figures, def. of, given in Aristotle 188
Similar rectilineal figures, similar figures on straight lines which are proportional are themselves proportional and conversely (VI. 22), alternatives for proposition 242—247
Similar segments of circles 5
Simon, Max 124 134
SIMPSON, THOMAS 121
Simson, R. 2 3 8 22 23 33 34 37 43 49 53 70 73 79 90 ll7 131 132 140 143—144 145 146 148 154 161 162 163 165 170—172 177 179 180 182 183 184 185 l86 189 I93 I95 209 211 212 230—231 238 252 269 270 272-273
Simson, R., Axioms to Book V. 137
Simson, R., Book VI. Prop. A extending VI. 3 to case where external angle bisected 197
Simson, R., important note showing flaw in V. 10 and giving alternative 156—157
Simson, R., Prop. B (inversion) 144
Simson, R., Prop. E (convertendo) 175
Simson, R., Props. B, C, D 222—227
Simson, R., remarks, on VI. 27—29 258—259
Simson, R., shortens V. 8 by compressing two cases into one 152—153
Simson, R.: Props. C, D (Book V.) connecting proportionals of VII. Def. 20 as particular case with those of V. Def. 5 126—129
Size, proper translation of in V. Def. 3 116—117 189—190
Smith and Bryant, alternative proofs of V, 16, 17, 18 by means of VI. 1, where magnitudes are straight lines or rectilineal areas 165—166 169 173—174
Solid numbers, three varieties according to relative length of sides 290—291
Spherical number, a particular kind of cube number 291
Square number, product of equal numbers 289 291
Square number, product of equal numbers, one mean between square numbers 294 363—364
Stobaeus 280
Subduplicate of any ratio found by VI. 13 216
Swinden, J.H. van 188
Tacquet, A. 121 258
Tannery, P. 112 113
Tartaglia, Niccolo 2 47
Taylor, H.M. 16 22 29 56 75 102 227 244 247 272
tetrahedron 98
Thales 111 280
Theodosius 37
Theon of Alexandria 43 109 117 119 149 152 161 186 190 234 235 240 242 250 262 311 322 412
Theon of Alexandria interpolation in V. 13 and Porism 144
Theon of Alexandria, additions to VI. 33 (about sectors) 274—276
Theon of Alexandria, interpolated Porism to VI. 20 239
Theon of Smyrna, in 119 279 280 281 284 285 286 288 289 290 291 292 293 294
Thrasyllus 292
Thymaridas 279 285
Timaeus of Plato 97—98 294—295 363
Todhunter, I. 3 7 22 49 51 52 67 73 90 99 172 195 202 204 208 259 271 272 300
Trapezium, name applied to truncated pyramidal numbers (Theon of Smyrna) 291
Triangle, Heron’s proof of expression for area in terms of sides, 87—88
Triangle, right-angled triangle which is half of equilateral triangle used for construction of tetrahedron, octahedron and icosahedron (Timaeus of Plato) 98
Triangular numbers 289
Triplicate, distinct from triple, ratio 133
Unit, connected etymologically by Theon of Smyrna and Nicomachus with (solitary) or (rest) 279
Unit, definitions of, by Thymaridas, “some Pythagoreans,” Chrysippus, Aristotle and others 279
Unit, Euclid’s definition was that of the “more recent” writers 279
Veronese, G. 30 126
Vieta, on angle of contact 42
Walker 204 208 259
Wallis, John, on angle of contact (“degree of curvature”) 42
Weierstrass 124
Woepcke 5
Zenodorus 276
“Chance equimultiples” in phrase “other, chance, equimultiples” 143—144
“Composite to one another” (of numbers) 286—287
“Dissimilarly ordered” proportion ( ) in Archimedes = “perturbed proportion” 136
“Division (of ratios)” see “Separation”
“Ordered” proportion ( ), interpolated definition of 137
“Parallelepipedal” (solid) numbers, two of the three factors differ by unity (Nicomachus) 290
“Perfect” (of a class of numbers) 293—294 421—425
“Perfect” (of a class of numbers), 3 also called “perfect” 294
“Perfect” (of a class of numbers), Pythagoreans applied term to 10 294:
“Quindecagon” (fifteen-angled figure), useful for astronomy 111
“Rule of three”, VI. 12 equivalent to 215
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Ðåêëàìà |
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