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Sorry for the post. I'll take it down soon.
Thanks for the help
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Can the Triangle Inequality Be Applied to Functions?
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Use the triangle inequality in this form:
$$||u|-|v|| \leq |u-v|$$
with ##u = f(x) - x## and ##v = f(y) - y##.
$$||u|-|v|| \leq |u-v|$$
with ##u = f(x) - x## and ##v = f(y) - y##.
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