Go backward to Example Go up to Top Go forward to Example (Continued) |
Let r subset (R x R) x (R x R) such that r(x, y) <=> x0+x1 = y0+y1.
[a]r denotes the line with slope -1 that goes through a:
[a]r = {b in R x R: a0+a1 = b0+b1} [a]r = {b in R x R: b1 = -b0+(a0+a1)}