Introduction to Quaternions, with Numerous Examples

Macmillan, 1873 - 227 σελίδες

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Σελίδα 9 - Any two sides of a triangle are together greater than the third side.
Σελίδα 90 - A point moves so that the sum of the squares of its distances from the points (0, 0), (1, 0) is constant.
Σελίδα 10 - FG [Hypothesit. and joined towards the same parts by the straight lines BE, CH. But straight lines which join the extremities of equal and parallel straight lines towards the same parts are themselves equal and parallel.
Σελίδα 91 - Thus a parabola is the locus of a point which moves so that its distance from a fixed point is equal to its distance from a fixed straight line (see fig.
Σελίδα 71 - Find the locus of a point whose distances from two given straight lines are in a given ratio.
Σελίδα 67 - Find the locus of a point such that the ratio of its distances from two fixed points is constant.
Σελίδα 6 - Hamilton extended algebra to space : ' ' He had done a considerable amount of good work, obstructed as he was, when about the year 1843, he perceived clearly the obstruction to his progress in the shape of an old law, which prior to that time, had appeared like a law of common sense. The law in question is known as the commutative law of multiplication. Presented in its simplest form it is nothing more than this : ' five times three is the same as three times five' ; more generally, it appears under...
Σελίδα 91 - IF we define a conic section as "the locus of a point which moves so that its distance from a fixed point bears a constant ratio to its distance from a fixed straight line
Σελίδα 153 - a where p is the perpendicular from the centre on the tangent plane, r the distance from the focus, and A, B the constants of integration.
Σελίδα 7 - A vector is the representative of transference through a given distance, in a given direction.

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