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Sequence, 73, 74, 77, 78 Series, 78 Signless numbers, 34 < Signs in mathematics, 5, 15, 20, 27, 35, 36, 48, 67 Similarity, 81 Sines, 22, 49 Space, 85 Space-perception, 74, 76 Sphere, equation of a, 46 Straight line, equation of a. 40, 42 Subtraction, 28, 30, 34 Sum of a series, 78 Surveying, 13, 18, 21, 22 Swift, 32 Symbolism, 20, 75, 82 Symbols of arithmetic, 29, 30 TANGENT to a curve, 45-46, 59, 65, 66, 68, 69, 70, 75, 76 Thales, 17, 18, 21 Theory of numbers, 74, 85 Thought, laws of, 84 Trigonometry, 20, 22, 49, 76 spherical, 22 UNITS, 63 VARIABLE, 11, 23, 24, 40, 46, 47, 48, 49, 69, 73, 86, 87 Velocity, 56, 57, 58, 59, 60, 71, 76 Viete, 25 Volumes, 50, 65 WALIIS, 63 Weierstrass, 73, 74, 80 ZBNO, 24, 60, 51
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