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2d
reviewed Approve Proving $a + a = a$ if a statement is true
2d
reviewed Approve Show that f: $\mathbb{R}$/$\mathbb{Z}$ $\to$ $\mathbb{R}$/$\mathbb{Z}$ orientation reversing. Then f(x) = x has exactly 2 solutions.
2d
reviewed Approve For $N\in \mathbb{N}$, do there exist natural numbers $N<n_1<n_2<\cdots<n_k$ such that $\frac{1}{n_1}+\cdots+\frac{1}{n_k}=1$?
Apr
21
reviewed No Action Needed Derivatives of semi-elasticities
Apr
21
reviewed Leave Open Proving by induction on the number of vertices that: every acyclic simple graph is bipartite
Apr
21
reviewed Close Is there any proof of the fundamental theorem of algebra that is preferred? In any given proof what makes it so intriguing?
Apr
21
reviewed Close Connection between Functional Analysis and Quantum Physics
Apr
21
reviewed Leave Open How many terms does it take in the expansion of arctan(x) to get pi to 10 decimal places?
Apr
21
reviewed Leave Open limit of a function raised to another function
Apr
21
reviewed Leave Open My dilemma about $0^0$
Apr
21
reviewed Leave Open Integral domain and ideal of ring
Apr
21
reviewed Leave Open Help with setting up this double integral
Apr
16
reviewed Approve How do you prove that a metric space $X$ is separable if and only if $X$ has a countable subset $Y$ with property below?
Apr
16
reviewed Looks OK Revised Simplex Method w/o Identity Matrix
Apr
16
reviewed Looks OK Proving the limit of a nested sequence
Apr
16
reviewed Looks OK Converting nonlinear second order ODE to first order
Apr
13
reviewed Leave Open Find the distance travelled by $P$ before it changes direction. (Mechanics)
Apr
13
reviewed Leave Open How many natural numbers less than $10^{2015}$ have their digits in non-decreasing order?
Apr
13
reviewed Leave Open Quadratic Integers in $\mathbb Q[\sqrt{-5}]$
Apr
13
reviewed Close I am going to learn these Mathematics Topics. I need advice and suggestions please .