SOLUTION: Prove the “ruler ﬂipping lemma”: if f : l → R is a coordinate function for a line l, then the function f0, deﬁned, for every point P ∈ l, by f0(P) = −f(P), is also a

SOLUTION: Prove the “ruler ﬂipping lemma”: if f : l → R is a coordinate function for a line l, then the function f0, deﬁned, for every point P ∈ l, by f0(P) = −f(P), is also a

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Question 1166437: Prove the “ruler ﬂipping lemma”: if f : l → R is a coordinate function for a line l, then the function f0, deﬁned, for every point P ∈ l, by f0(P) = −f(P), is also a coordinate function for l.

Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

Whether is it not obvious ?

To prove such things means to spend time and efforts for nothing.

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