Constructive geometry of plane curves. With numerous by Thomas Henry Eagles

By Thomas Henry Eagles

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If k is not ordered, the line segment {x, y) should be viewed as consisting of the two points x and y and nothing else. The line segment {x, y} lies on the unique line xvy. If the line segments {x, y} and {p, q) lie on parallel lines, they are called parallel line segments. An oriented line segment is an ordered pair of distinct points (x, y) of X. Of course, the oriented line segments (x, y) and (y, x) are different, even though the nonoriented line segments {x, y} and {y, x} are the same. , q) are called parallel if the corresponding line segments {x, y} and {p, q} are parallel.

Consider the binary relation ^ for L defined by (x, y) ~ (p, q) if the line segments (x, y) and (p, q) are parallel. a. Prove that ^ is an equivalence relation for L. b. Prove that there is a one-to-one correspondence between the set of equivalence classes of the resulting partitioning of L and the set of one-dimensional subspaces of V. *4. Assume the division ring k is ordered. (Whenever this assumption is made, readers who are not familiar with ordered division rings or ordered fields should use the field of real numbers or the field of rational numbers for k.

Prove directly from the equations that the point D(x0) has co­ ordinates (al9 . . , an). *2. Let A9 B G V9 c e X9 and r9se k*. Prove that TAM(c9 r)TBM(c9 s) = TA+rBM(c9 rs). ) 3. Let χθ9 Αί9 . . , An be a coordinate system for X. Consider the dilation TM(c9 r) where the vector A has coordinates (al9 . . , an) and the point c has coordinates (cl9 . . , cn). Prove that the equations of D are yx = rxl + (1 - r)cx + ax yn = rxn + (1 - r)c„ + an. 13.

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