Taylor - Theoretic Arithmetic.pdf - Platonic Philosophy

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$Fin of natural effects. Because likewise it opens and shuts the recesses of generation, it is denominated, as the anonymous author observes, the key-bearer of nature, as is also the mother of the Gods who is represented with a key. But it is the introducer and cause of the constitution and permanency of the mathematical disciplines, because these are four in number, viz. arithmetic and geometry, music and astronomy; and also because the first numbers and the first forms subsist in the intelligible tetrad. It is likewise said to be the nature of Aeolus, on account of the variety of its peculiarity, according to the anonymous writer, and because without this it would be impossible for the orderly and universal distribution of things to subsist. With respect to the other appellations of the tetrad, as Meursius in his Denarius Pythagoricus has given but few extracts from the anonymous writer, though his treatise professedly contains an explanation of these names, and as I cannot find a satisfactory development of them in any ancient writer, the appellation Harmonia excepted, I shall not attempt any elucidation of them. But the tetrad was very properly called by the Pythagoreans harmony, because the quadruple ratio forms the symphony disdiapason. They also called the tetrad the first depth, because they considered a point as analogous to the monad, a line to the duad, a superficies to the triad, and a solid to the tetrad. They likewise denominated it justice, because, as we are informed by Alexander Aphrodisiensis (in Metaphys. major. cap. 5.) they were of opinion that the peculiarity of justice is compensation and equability, and finding this to exist in numbers, they said that the first evenly-even number is justice. For they asserted that which is first in things which have the same relation, to be especially that which it is said to be. But the tetrad is this number, because since it is the first square, it is divided into even numbers, and is even. The tetrad also was called by the
Pythagoreans every number, because it comprehends in itself all the numbers as far as to the decad, and the decad itself; for the sum of 1. 2 3. and 4, is 10. Hence both the decad and the tetrad were said by them to be every number; the decad indeed in energy, but the tetrad in capacity. The sum likewise of these four numbers was said by them to constitute the tetractys, in which all harmonic ratios are included. For 4 to 1, which is a quadruple ratio, forms, as we have before observed, the symphony disdiapason; the ratio of 3 to 2, which is sesquialtcr, forms the symphony diapente; 4 to 3, which is sesquitertian, the symphony diatessaron; and 2 to 1, which is a duple ratio, forms the diapason. Having however mentioned the tetractys, in consequence of the great veneration paid to it by the Pythagoreans, it will be proper to give it more ample discussion, and for this purpose to show from Theo of Smyrna,# how many tetractys there are: "The tetractys," says he, "was not only principally honoured by the Pythagoreans, because all symphonies are found to exist within it, but also because it appears to contain the nature of all things." Hence the following was their oath: "Not by him who delivered to our soul the tetractys, which contains the fountain and root of everlasting nature." But by him who delivered the tetractys they mean Pythagoras; for the doctrine concerning it appears to have been his invention. The above mentioned tetractys therefore, is seen in the composition of the first numbers 1. 2. 3. 4. But the second tetractys arises from the increase by multiplication of even and odd numbers beginning from the monad. Of these, the monad is assumed as the first, because, as we have before observed, it is the principle of all even, odd, and evenly-even numbers, and the nature of it is simple. But the three successive numbers receive their compe sition according to the even and the odd; because every num- In Mathemat. p. 147.
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THEORETIC ARITHMETIC IN THREE BOOKS
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IV INTRODUCTION the mathematical di
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INTRODUCTION works, like the remain
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VIII INTRODUCTION fore, that the so
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INTRODUCTION the other of such as a
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XII INTRODUCTION must her inherent
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XIV INTRODUCTION principles existin
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XVI INTRODUCTION indissoluble perma
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XVIII INTRODUCTION mathematics to p
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XX INTRODUCTION utility it administ
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XXII INTRODUCTION may not energize
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INTRODUCTION tradition, however, of
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XXVI INTRODUCTION Nicomachus, which
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INTRODUCTION perplexity, and that h
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INTRODUCTION ever, requisite that w
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XXXII INTRODUCTION that he is ignor
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XXXIV INTRODUCTION tirely the prais
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THEORETIC ARITHMETIC BOOK ONE CHAPT
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that all motion is after rest, and
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since it is not possible for divisi
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dle. And these indeed are the commo
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monad is either even or odd. It can
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is denominated the evenly-odd, and
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terms should accord with its proper
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ural order, 1.3.5.7.9.11.13.15.17.
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agreeably to the form of the evenly
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12, 20, and 28, the sum of the extr
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numbers proceeding from them are re
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THE generation however and origin o
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ever will give the mode of measurin
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THE SIEVE OF ERATOSTHENES. Here 7 m
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pass the sum of the whole number, i
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CHAPTER XV. On the generation of th
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CHAPTER XVI. On relative quantity,
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consequent order, these even number
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For the sesquialter has for its lea
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CHAPTER XIX. That the multiple is m
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which 4 is, is compared with the ro
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number besides containing the whole
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superquadripartient, may likewise b
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to them, duple sesquiquartan ratios
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the impression of itself, defines a
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If, however, the multiples which ar
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tan, the superquadripartient ratio
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BOOK TWO CHAPTER I. How all inequal
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BOOK Two 57 reduced to equality. Fo
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BOOK Two 59 alters as much distant
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BOOK Two 61 ratio is composed from
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BOOK Two CHAPTER IV. On the qztanti
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BOOK Two 65 distended by a triple d
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These triangular numbers are genera
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BOOK Two 69 But in these numbers al
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BOOK Two 71 triangle of a class imm
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BOOK Two 73 22 is formed from the s
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BOOK Two 75 third, a pentagonal; th
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Two does not only not arrive at uni
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BOOK Two 79 to have four angles and
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BOOK Two 81 parity. Hence, in conse
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BOOK Two 83 the principles of thing
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BOOK Two 85 from the monad, are sai
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pared with the first number longer
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BOOK Two 89 and twice 16, has for i
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atios. Let them, therefore, be alte
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BOOK Two 93 ity. For 1 is the whole
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BOOK Two 95 ticipate of an immutabl
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BOOK Two 97 are opposite to those a
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BOOK Two is equal to the sum of the
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BOOK Two 101 will be the same multi
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BOOK Two 103 terms there is a great
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BOOK Two 105 from 8, and one side f
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BOOK Two 107 by the greater, by the
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BOOK Two 109 tertian ratio, or that
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BOOK Two 111 ratio, arises from a c
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BOOK Two 113 to 10 is a quadruple r
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BOOK Two 115 For here the greatest
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BOOK Two 117 by length, breadth, an
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BOOK Two The greatest harmonies. Pr
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BOOK Two 121 which is 18416, we mus
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BOOK Two former diameter, exceeds i
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BOOK Two In the geometrical fractio
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BOOK Two The parts of 51=17)
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BOOK Two 129 In the second place, i
Page 169 and 170: BOOK Two them; (see Chap. 15, Book
Page 171: BOOK Two 133 of this series into th
Page 174 and 175: Here it is evident in the first ins
Page 176 and 177: Farther still, if 2 be subtracted f
Page 178 and 179: 24575, and 301989887. And the two i
Page 180 and 181: In like manner if 9437056 be divide
Page 182 and 183: These numbers are as follows: In th
Page 184 and 185: That the reader may see the truth o
Page 186 and 187: all perfectly as well as all imperf
Page 188 and 189: parts of these wholes have sometime
Page 190 and 191: these, and are called by modern mat
Page 192 and 193: The numbers, therefore, that form 1
Page 194 and 195: with each other, it will be found,
Page 196 and 197: PYTHAGORAS
Page 198 and 199: ples of these; referring the point
Page 200 and 201: If it be requisite, however, to spe
Page 202 and 203: the image of the never-failing and
Page 204 and 205: that they are separate, they are no
Page 206 and 207: 27, but they signify through these
Page 208 and 209: dissimilarly similar to divinity. I
Page 210 and 211: anonymous author, in consequence of
Page 212 and 213: It is also Justice, and Isis, Natur
Page 214 and 215: adytum of god-nourished silence, as
Page 216 and 217: called Cupid for the reason above a
Page 218 and 219: the diapente, and the diatessaron.
Page 222 and 223: er is not alone even, nor alone odd
Page 224 and 225: the vegetative life. And the seed i
Page 226 and 227: and beauty. And in external things,
Page 228 and 229: which are productive of life after
Page 230 and 231: one side, and 1 on the other, each
Page 232 and 233: The same writer also observes, "tha
Page 234 and 235: position; for I conjecture this to
Page 236 and 237: ~ c ~ ~ ~ Or ~ Q rather, ~ v . whic
Page 238 and 239: The ratio of 12 to 9 is sesquiterti
Page 240 and 241: monad. Thus if from each of the num
Page 242 and 243: had these appellations in consequen
Page 244 and 245: and well-ordered digression (from t
Page 246 and 247: unity is added to the product, the
Page 248 and 249: And so of the rest, which abundantl
Page 250 and 251: Again, of any two numbers whatever,
Page 252 and 253: Again, if 4 multiplies any triangul
Page 254 and 255: With respect to the hexad, it is th
Page 256 and 257: and the double of it 12, the number
Page 258 and 259: incorporeal and corporeal essence;
Page 260 and 261: of the hebdomad 3 and 4 necessarily
Page 262 and 263: composition of which the hebomad is
Page 264 and 265: it is also surpassed by the last nu
Page 266 and 267: excite the glad husbandmen to the c
Page 268 and 269: mentioned particulars, but also to
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7X 1 and +1= 8 the 2nd 7 x 8 and +
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8X 1 and +1= 9 the 2ndl 8X 7and +1=
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10X 1 and +1= 11 the 2ndl i' 10x30
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tureX according to this number. In
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through a good allotment, or throug
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titude, and communion with itself,
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evenlyeven numbers, and for not dis
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ing this table from the Epanthematc
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for instance, 12 is a number longer
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