Osgood, William F. (William Fogg), 1864-1943, Graustein, William Caspar, 1888-1941, joint author · New York, The Macmillan company · leaf 20
ere, A = oo. This does not mean that V hasa slope, which is infinite, for infinity is not a number. Itis merely a brief andsymbolic way of describ-ing the behavior of X fora line L, near to, but notcoincident with V; itsays that for such a lineA. is numerically verylarge: and further that,when the… … The Angle 6. In measuring the angle from one line to an-other, it is essential, first of all, to agree on which directionof rotation shall be considered as positive. We shall takealways as the positive direction of rotation that from the posi-tive axis of x to the positive axis of y ; so that the…
Geometry, Analytic
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