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Aug
9
comment How to test whether a set of four points can form a parallelogram
I think we need 4 tests. Your answer needs one more test which is $\vec{P_1P_2}=\vec{P_3P_4}$.
Aug
9
comment How to test whether a set of four points can form a parallelogram
Please explain why you compared just those vectors.
Aug
9
comment How to test whether a set of four points can form a parallelogram
@augurar: The given points are randomly chosen from a set of some points. The order is not known.
Aug
9
asked How to test whether a set of four points can form a parallelogram
Jul
28
revised How to find the intersection points of lines that are normal to two curves?
added 182 characters in body
Jul
28
asked How to find the intersection points of lines that are normal to two curves?
Jul
4
comment Is my theorem correct? $f(x) \leq g(x)$ for $x\geq a$ iff $f'(x) \leq g'(x)$ for $x\geq a$ and $f(a)=g(a)$.
what is the name of the well known corollary?
Jul
4
comment Is my theorem correct? $f(x) \leq g(x)$ for $x\geq a$ iff $f'(x) \leq g'(x)$ for $x\geq a$ and $f(a)=g(a)$.
By assuming the right side is satisfied first and prove that the left is either correct or incorrect.
Jul
4
comment Is my theorem correct? $f(x) \leq g(x)$ for $x\geq a$ iff $f'(x) \leq g'(x)$ for $x\geq a$ and $f(a)=g(a)$.
Could you prove in both directions?
Jul
4
asked Is my theorem correct? $f(x) \leq g(x)$ for $x\geq a$ iff $f'(x) \leq g'(x)$ for $x\geq a$ and $f(a)=g(a)$.
Jul
2
awarded  Curious
May
9
answered What is the non-piecewise curve that resembles the following roller coaster track?
May
7
comment What is the non-piecewise curve that resembles the following roller coaster track?
@Neil: Any parameter is accepted.
May
7
comment What is the non-piecewise curve that resembles the following roller coaster track?
@vonbrand: I don't want to use if-then-else construct in my code. :-)
May
7
revised Functions Question
Completing the math markup.
May
7
comment What is the non-piecewise curve that resembles the following roller coaster track?
I cannot show my effort to solve this problem. Is it necessary to show it?
May
7
comment Functions Question
Commutative by accident.
May
7
suggested approved edit on Functions Question
May
7
asked What is the non-piecewise curve that resembles the following roller coaster track?
May
6
revised How to determine the coordinate of roller coaster's wheels?
added 366 characters in body