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 Feb6 reviewed Reject Proof of geometric sum relation by mathematical induction Jan26 revised How to find the inverse arc in the configuration space Minor LaTeX edits. Dec10 reviewed Approve Basic set theory proof about cardinality of cartesian product of two finite sets Dec5 comment Finitely generated modules Dec5 comment Components are clopen in a space with a finite number of connected components Each component is closed. Hence, the complement of each component is open. But each component is itself a finite intersection of complements of components, hence is also open. Oct30 reviewed Approve how to proceed ? Have I correctly transformed the question to an equation? Oct30 comment Find all numbers $c$ that satisfy Mean Value Theorem Not all of these solutions are in the specified interval, however. Oct30 comment Find all numbers $c$ that satisfy Mean Value Theorem The derivative is $\frac{1}{3}x^{-2/3}$, which is different from what you have written. Oct29 reviewed Edit Getting $P^1$ by the sphere $S^1$ Oct29 revised Getting $P^1$ by the sphere $S^1$ correct spelling Oct29 reviewed Approve Differentiation of a circle Oct29 reviewed Reject Selecting groups of items: How many ways can we divide n students into groups of two? Oct28 reviewed Approve True or false? For every element $r$ in a ring $R$, if $r\neq 1$, then $1 − r$ is invertible. Oct6 reviewed Approve How to prove $\frac{(a_1 a_2\cdots a_n)^2-1}{8}\equiv\sum_{i=1}^n\frac{a^2_i -1}{8}\pmod 8$ Oct6 answered Help explaining sum notation Oct1 reviewed Approve Prove A ∩ B = empty set iff A ⊆ B complement Oct1 reviewed Reject Probablity of getting white balls. (Explanation). Sep30 awarded Explainer Sep26 reviewed Approve Calc question about inequality and electric circuit theory Sep24 awarded Autobiographer