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Let r subset (R x R) x (R x R) such that r(x, y) <=> x0+x1 = y0+y1.

[a]r = {b in R x R: a0+a1 = b0+b1}
[a]r = {b in R x R: b1 = -b0+(a0+a1)}
[a]r denotes the line with slope -1 that goes through a:

Author: Wolfgang Schreiner
Last Modification: January 12, 2000

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