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Jan
18
revised $\{ (x,y) \in R^2 \mid x^2 + y^2 -2x + 4y - 11 = 0 \}$ is closed and bounded
corrected 1 to R
Jan
18
suggested approved edit on $\{ (x,y) \in R^2 \mid x^2 + y^2 -2x + 4y - 11 = 0 \}$ is closed and bounded
Dec
27
comment Example of a relation that is reflexive but not symmetric
@BrianO The strict variants are not reflexive.
Dec
16
comment Unit Plus Nilpotent Is Unit
Taylor series expansion?
Dec
6
revised Show that a generalized knight can return to its original position only after an even number of moves
previous title was misleading
Dec
6
suggested approved edit on Show that a generalized knight can return to its original position only after an even number of moves
Nov
3
awarded  Nice Answer
Nov
3
awarded  Yearling
Nov
2
awarded  Teacher
Nov
2
answered Which of the following powers is bigger: $2^{41}$ or $3^{24}$?
Aug
23
comment Solve $y^2 + 3xy - 10x^2 + y + 5x = 0$ for y in terms of x
Solve y in terms of x, or x in terms of y? Because y in terms of y doesn't make sense.
Jun
24
revised Two different trigonometric identities giving two different solutions
improved TeX formatting, especially using \cos and \sin and {align*} environments
Jun
24
suggested approved edit on Two different trigonometric identities giving two different solutions
Mar
1
comment Let $A$ and $B$ be sets, then if $A \subseteq B$ then $A \cap B = A$
I think you've reversed $\subseteq$ and $\supseteq$.
Sep
23
comment The myth of no prime formula?
@mathh Your \exists should be \nexists.
Sep
9
comment Can't find mistake in an easy proof.
@Frunobulax corrected now.
Sep
9
comment How to solve this limits question
For this solution to be correct, you need to show that the original expression is an indeterminate form $\infty/\infty$, which is not completely obvious from the expression as written.
Sep
9
revised Can't find mistake in an easy proof.
fix variable names
Sep
9
suggested approved edit on Can't find mistake in an easy proof.
Jul
29
awarded  Organizer