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location Los Angeles, CA
age 34
visits member for 3 years, 7 months
seen 11 hours ago

Assistant Professor of Mathematics


Dec
10
reviewed Approve Basic set theory proof about cardinality of cartesian product of two finite sets
Dec
5
comment Finitely generated modules
Maybe see math.stackexchange.com/questions/8996/…
Dec
5
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.
Nov
15
reviewed Approve List or characterize all of the units in each of the following rings
Oct
30
reviewed Approve how to proceed ? Have I correctly transformed the question to an equation?
Oct
30
comment Find all numbers $c$ that satisfy Mean Value Theorem
Not all of these solutions are in the specified interval, however.
Oct
30
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.
Oct
29
reviewed Edit Getting $P^1$ by the sphere $S^1$
Oct
29
revised Getting $P^1$ by the sphere $S^1$
correct spelling
Oct
29
reviewed Approve Differentiation of a circle
Oct
29
reviewed Approve What does G represent in the Position Function?
Oct
29
reviewed Reject Selecting groups of items: How many ways can we divide n students into groups of two?
Oct
28
reviewed Approve True or false? For every element $r$ in a ring $R$, if $r\neq 1$, then $1 − r$ is invertible.
Oct
6
reviewed Approve How to prove $\frac{(a_1 a_2\cdots a_n)^2-1}{8}\equiv\sum_{i=1}^n\frac{a^2_i -1}{8}\pmod 8$
Oct
6
answered Help explaining sum notation
Oct
1
reviewed Approve Prove A ∩ B = empty set iff A ⊆ B complement
Oct
1
reviewed Reject Probablity of getting white balls. (Explanation).
Sep
30
awarded  Explainer
Sep
26
reviewed Approve Calc question about inequality and electric circuit theory
Sep
24
awarded  Autobiographer