Smart, Edward Howard · London : Macmillian and Co. · leaf 30
ments at Infinity. An important assumption will now bs made by which wecan avoid the necessity of the special treatment of cases ofparallelism, and aid that process of generalisation whichmathematics seeks to develop and extend. This assumption is that On every straight line of unlimited length… … Fig. 1. If the turning is continued in the same sense, e.g. counter-clockwise, the point of intersection of x and j:» travels along xalways in the same direction (in the figure from left to right)till it disappears from view, and, if the turning is continued,reappears, as we should say, at the…
Geometry, Projective
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