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Apr
27
reviewed Close On the following of the question: every $k$-dimensional vector subspace $V$ of …
Apr
27
reviewed Close Area of surface
Apr
27
reviewed Leave Open finding a third 3d point in a series
Apr
27
reviewed Leave Open If $f(a+re^{it})\in \Bbb{R}$ for all $t\in \Bbb{R}$ then $f$ is constant.
Apr
27
reviewed Leave Open Ring Homomorphism Textbook Question
Apr
27
reviewed Close Tensor algebra becomes a graded $R$-algebra short proof verification
Apr
27
reviewed Approve Solve integral with exponent
Apr
27
reviewed Approve Evaluate $\lim_{x \to \infty} xe^{-x}+be^{-x}$
Apr
27
reviewed Reject Smooth manifold
Apr
27
reviewed Approve In which algebraic setting can I state (and prove) the binomial theorem?
Apr
25
reviewed Approve $y_{2n}, y_{2n+1}$ and $y_{3n}$ all converge. What can we say about the sequence $ y_n$?
Apr
25
reviewed Approve Proving $T(n) = 1 + \sum_{j=0}^{n-1} T(j)$, $T(0)=1$ implies $T(n)=2^n$
Apr
21
reviewed Leave Open Common terms between two arithmetic series
Apr
21
reviewed Leave Open A proof about boundedness for continuous functions
Apr
21
reviewed Leave Open Why $R/AB$ is cyclic?
Apr
21
reviewed Approve Dropping the lowest number in a set lowers the mean average of the set.
Apr
21
reviewed Approve Riemann Sum proofs
Apr
12
awarded  Nice Answer
Mar
31
comment Push Down Automata
What have you tried so far? Also, do you know how to construct a PDA for $a^nb^n$? If you have one for $a^nb^n$ and one for $a^nc^n$, what can you do with that?
Mar
5
awarded  Yearling