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Differential geometry : paramterization of an absolute value function

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Jan27-10, 02:19 PM
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I need help with the following question:

for the absolute value function y = |x-1| in R2

a) A parametrization of the curve
b) a four times differentiable parametrization of this curve
c) is there a regular parametrization

Can I parametrize this curve by setting x = t^2 --> y = |t^2 -1|?
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