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seen Oct 4 at 7:56

Jan
29
revised Smallest Non-negative number in a matrix
added 482 characters in body
Jan
29
answered Smallest Non-negative number in a matrix
Oct
29
comment Can elements in a set be duplicated?
Sets does not have repeated elements. n(A) equals 7.
Oct
8
comment Is the empty set a power set?
Isn't $\{\emptyset\}$ different from $\emptyset$?
Oct
8
answered GRE 9378 question 23
Oct
8
comment What is a hexagon?
According to wikipedia, it has 6 edges and 6 vertices. The lines should not cross each other to create extra vertices.
Oct
8
comment Show the negative derivative of a function.
Then the answer can be wrong. You can see the $U_0$ is not the coefficient of the second term, so it can't be taken out as common as in the expression on $F$.
Oct
6
awarded  Teacher
Oct
5
comment Show the negative derivative of a function.
But it doesn't equals to the one which you gave.
Oct
5
awarded  Editor
Oct
5
revised Show the negative derivative of a function.
added 379 characters in body
Oct
5
answered Show the negative derivative of a function.
Oct
5
awarded  Supporter