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Apr
20
awarded  Favorite Question
Apr
17
reviewed Looks OK In a train of n wagons, at random m passengers enter choosing a wagon..
Apr
17
answered Commutative rings and ideals, showing a map is well defined
Apr
17
revised power series steps help
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Apr
17
answered How can I start to learn proof theory?
Apr
16
reviewed Close Something to the power of infinity is equal to?
Apr
16
reviewed Close When is a product of [0,1] separable?
Apr
16
revised Proving $A$ is a subset of $B$
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Apr
16
revised Proving $A$ is a subset of $B$
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Apr
16
comment Prove: The product of any three consecutive integers is divisible by 6.
@EthanAlvaree: Consider a list of three consecutive integers: $m$, $m+1$, $m+2$. Now dividing $n$ by $3$ will give you a unique remainder $0\leq r < 3$. That is, $r= 0, 1$, or $2$. Now you can just do the three cases. If $r= 0$, then $n$ is divisible by $3$. If $r=1$, then $n+2$ is divisible by $3$. If $r=2$, then $n+1$ is divisible by $3$. The general case you can do likewise with some type of induction argument on the remainder.
Apr
11
answered how $1/0.5$ is equal to $2$?
Mar
28
awarded  Good Question
Mar
6
revised Evaluate $\sum_{n=0}^{N-1} \exp(2 \pi \frac{n}{N} i)$
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Mar
6
reviewed Close the $\sigma$ algeba generated by the class of open intervals with rational end points coincide with the borel $\sigma$ algebra on the real line.
Mar
6
reviewed Leave Open Algebraically why is that $\cos(0) =1$?
Mar
3
awarded  Yearling
Feb
24
answered Simplicity of result of differentiation?
Feb
23
comment Solving the equation $\sqrt[3]{x^2 + 15} = 2\sqrt[3]{x+1}$
@ANNALIA: I don't understand. This is how you would (could) solve your equation.
Feb
23
comment Solving the equation $\sqrt[3]{x^2 + 15} = 2\sqrt[3]{x+1}$
@ANNALIA: If you mean if it is necessary to check, then no it is not.
Feb
23
comment Solving the equation $\sqrt[3]{x^2 + 15} = 2\sqrt[3]{x+1}$
@ANNALIA: What do you mean by a necessity?