Dec
18
reviewed Edit Prove $a^ab^bc^c\ge (abc)^{\frac{a+b+c}3}$ for positive numbers.
Dec
18
revised Prove $a^ab^bc^c\ge (abc)^{\frac{a+b+c}3}$ for positive numbers.
typo correction, latex improvement
Dec
10
answered Ways to write “50”
Dec
10
answered Dynamic programming:Making a Change
Dec
10
reviewed Approve english to metric conversion with cubes
Dec
10
comment Dynamic programming:Making a Change
no, this is not a dynamic programming approach.
Dec
9
comment Dynamic programming:Making a Change
so which coin values do you have and how many of them? Why don't you check five one-dollar and one five-dollar coins?
Dec
9
comment Dynamic programming:Making a Change
I can't catch your idea. Can you explain more? Maybe there will be a more instructive example. You did not mention which types of coin denomination you have. why don't you check five one-dollar and oen five-dollar notes?
Dec
9
awarded  Caucus
Dec
9
comment Binary operation commutative, associative, and distributive over multiplication
what have you tried?
Dec
7
reviewed Approve Riemann integrals real analysis
Dec
6
reviewed Approve Counterexample for non-prime ideal
Dec
6
reviewed Approve Fourier Transform of $1/(\pi\cdot t)$ by Duality
Dec
5
reviewed Approve Prove that $ y''(0) = -1, x = \cos\left(\frac{t}{1+t}\right), y = \sin\left(\frac{t}{1+t}\right)$
Dec
3
reviewed Edit Solving linear first order differential equation with hard integral
Dec
3
revised Solving linear first order differential equation with hard integral
improved format
Dec
1
revised Confused on a question on sets and functions
typo
Dec
1
revised Confused on a question on sets and functions
typo
Dec
1
reviewed Reject Exact closed form of recurrence $4F(n/4)+n^2$, $F(1)=1$, n is a power of 4
Dec
1
reviewed Approve Consider ODE ; find solution(s).