Taylor - Theoretic Arithmetic.pdf - Platonic Philosophy

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that middle which is alone conversant with the difference of number. That is called an arithmetical middle, therefore, when three or more terms being given, an equal and the same difference is found between all of them; in which the identity of ratio being neglected, the difference only of the terms is considered. Thus in the natural series of numbers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10, the differences are equal, but there is not the same ratio and habitude. If, therefore, three terms are given, the proportionality is said to be continued. But if there are four or more terms, the middle is called disjunct. Whether, however, the terms are three or four, or any other number, there will always be the same difference of the terms, the ratios only being changed. Thus the differences of the terms 1.2.3. are the same, but the ratios are different. For 2 to 1 is a duple, but 3 to 2 is a sesquialter ratio. And the same thing will take place in the other terms. If, also, an equal number of terms are omitted, the differences will be equal, but the ratios different. Thus if one term is omitted, the difference will be 2; for then the terms will be 1. 3. 5. the difference between which is 2. But the ratio of 3 to 1 is very different from that of 5 to 3. If two terms are omitted, the difference will be 3; if three terms are omitted, it will be 4; and so of the rest, both in continued and disjunct proportions. But the quality of the ratio will not be the same, though the terms are distributed by equal differences. If, however, conversely, there should be the same quality of ratio, but not the same differences, such proportionality is called geometrical, but not arithmetical. It is the peculiarity of this middle, that in three terms, the sum of the extremes is double the mean; as in 1. 2. 3, 1+3= 4=2~2. But if there are four terms, the sum of the extremes
BOOK Two is equal to the sum of the two means. Thus if the terms are 1. 2. 3. 4., 1+4=2+3. This also is a very subtile property of this proportion, which no one of the ancients who were skilled in the mathematical disciplines discovered, except Nicomachus, that in every continued arrangement of terms, the rectangle under the extremes, is less than the square of the middle, by the product arising from one difference multiplied by the other. Thus in the three terms, 3, 5, 7, 3)
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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
Page 86 and 87: the impression of itself, defines a
Page 88 and 89: If, however, the multiples which ar
Page 90 and 91: tan, the superquadripartient ratio
Page 93 and 94: BOOK TWO CHAPTER I. How all inequal
Page 95 and 96: BOOK Two 57 reduced to equality. Fo
Page 97 and 98: BOOK Two 59 alters as much distant
Page 99 and 100: BOOK Two 61 ratio is composed from
Page 101 and 102: BOOK Two CHAPTER IV. On the qztanti
Page 103 and 104: BOOK Two 65 distended by a triple d
Page 105 and 106: These triangular numbers are genera
Page 107 and 108: BOOK Two 69 But in these numbers al
Page 109 and 110: BOOK Two 71 triangle of a class imm
Page 111 and 112: BOOK Two 73 22 is formed from the s
Page 113 and 114: BOOK Two 75 third, a pentagonal; th
Page 115 and 116: Two does not only not arrive at uni
Page 117 and 118: BOOK Two 79 to have four angles and
Page 119 and 120: BOOK Two 81 parity. Hence, in conse
Page 121 and 122: BOOK Two 83 the principles of thing
Page 123 and 124: BOOK Two 85 from the monad, are sai
Page 125 and 126: pared with the first number longer
Page 127 and 128: BOOK Two 89 and twice 16, has for i
Page 129 and 130: atios. Let them, therefore, be alte
Page 131 and 132: BOOK Two 93 ity. For 1 is the whole
Page 133 and 134: BOOK Two 95 ticipate of an immutabl
Page 135: BOOK Two 97 are opposite to those a
Page 139 and 140: BOOK Two 101 will be the same multi
Page 141 and 142: BOOK Two 103 terms there is a great
Page 143 and 144: BOOK Two 105 from 8, and one side f
Page 145 and 146: BOOK Two 107 by the greater, by the
Page 147 and 148: BOOK Two 109 tertian ratio, or that
Page 149 and 150: BOOK Two 111 ratio, arises from a c
Page 151 and 152: BOOK Two 113 to 10 is a quadruple r
Page 153 and 154: BOOK Two 115 For here the greatest
Page 155 and 156: BOOK Two 117 by length, breadth, an
Page 157 and 158: BOOK Two The greatest harmonies. Pr
Page 159 and 160: BOOK Two 121 which is 18416, we mus
Page 161 and 162: BOOK Two former diameter, exceeds i
Page 163 and 164: BOOK Two In the geometrical fractio
Page 165 and 166: BOOK Two The parts of 51=17)
Page 167 and 168: 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
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all perfectly as well as all imperf
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parts of these wholes have sometime
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these, and are called by modern mat
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The numbers, therefore, that form 1
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with each other, it will be found,
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PYTHAGORAS
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ples of these; referring the point
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If it be requisite, however, to spe
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the image of the never-failing and
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that they are separate, they are no
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27, but they signify through these
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dissimilarly similar to divinity. I
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anonymous author, in consequence of
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It is also Justice, and Isis, Natur
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adytum of god-nourished silence, as
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called Cupid for the reason above a
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the diapente, and the diatessaron.
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$Fin of natural effects. Because li
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er is not alone even, nor alone odd
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the vegetative life. And the seed i
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and beauty. And in external things,
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which are productive of life after
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one side, and 1 on the other, each
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The same writer also observes, "tha
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position; for I conjecture this to
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~ c ~ ~ ~ Or ~ Q rather, ~ v . whic
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The ratio of 12 to 9 is sesquiterti
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monad. Thus if from each of the num
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had these appellations in consequen
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and well-ordered digression (from t
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unity is added to the product, the
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And so of the rest, which abundantl
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Again, of any two numbers whatever,
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Again, if 4 multiplies any triangul
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With respect to the hexad, it is th
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and the double of it 12, the number
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incorporeal and corporeal essence;
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of the hebdomad 3 and 4 necessarily
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composition of which the hebomad is
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it is also surpassed by the last nu
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excite the glad husbandmen to the c
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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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