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15
Math.TechQA.Club
2019-05-12 22:45:09
64
Views
needing help for proofing $\frac{de^x}{dx}=e^x$
Published on
12 May 2019 - 22:45
#derivatives
#proof-writing
#proof-explanation
20
Views
$|z^n|< \epsilon/4$ by taking $n > \log(4/\epsilon) / \log(1/|z|)$
Published on
12 May 2019 - 23:27
#inequality
#proof-explanation
100
Views
In a locally compact 2nd-countable Hausdorff space $E$ there is a sequence of compact subsets $K_n$ with $K_{n-1}⊆\overset∘{K_n}$ and $\bigcup_nK_n=E$
Published on
25 Mar 2026 - 6:22
#general-topology
#proof-explanation
#compactness
#second-countable
9.8k
Views
Compute polynomial $p(x)$ if $x^5=1,\, x\neq 1$ [reducing mod $\textit{simpler}$ multiples]
Published on
28 Mar 2026 - 10:40
#polynomials
#ring-theory
#modular-arithmetic
#proof-explanation
#divisibility
154
Views
Graph with expansion of $K_5$ has subgraph which is expansion of $K_{3,3}$.
Published on
26 Mar 2026 - 4:36
#graph-theory
#solution-verification
#proof-explanation
425
Views
LU composition of a tridiagonal matrix
Published on
01 Apr 2026 - 14:25
#proof-explanation
#matrix-decomposition
#tridiagonal-matrices
471
Views
Proof explanation: Every module is the quotient of free module
Published on
25 Mar 2026 - 11:53
#abstract-algebra
#commutative-algebra
#proof-explanation
#free-modules
126
Views
Please explain the proof of the validity of the Cauchy convergence criterion for real number sequences.
Published on
14 May 2019 - 2:15
#real-analysis
#limits
#elementary-number-theory
#proof-explanation
#real-numbers
295
Views
Questions about Hartshorne Proposition II.5.9
Published on
25 Mar 2026 - 12:53
#algebraic-geometry
#proof-explanation
#sheaf-theory
#schemes
#quasicoherent-sheaves
60
Views
Why can we let $x = 2\cos t\ $ in the solution for the following system of equations
Published on
26 Mar 2026 - 16:56
#algebra-precalculus
#proof-explanation
#systems-of-equations
#substitution
79
Views
Complex Analysis - Showing function is holomorphic
Published on
15 May 2019 - 15:37
#complex-analysis
#proof-explanation
25
Views
proof of ED* = (n - 1) / n * D
Published on
15 May 2019 - 23:07
#statistics
#proof-explanation
196
Views
Quadratic reciprocity and decomposition of primes in cyclotomic fields
Published on
25 Mar 2026 - 3:24
#proof-explanation
#algebraic-number-theory
#quadratic-reciprocity
#cyclotomic-fields
268
Views
monotonic function can only have simple discontinuity
Published on
26 Mar 2026 - 9:39
#real-analysis
#continuity
#proof-explanation
#supremum-and-infimum
#monotone-functions
49
Views
are $\sum_{i=0}^{n}i$ and $\sum_{i=n}^{0}i$ equivalent?
Published on
01 Apr 2026 - 20:30
#summation
#algorithms
#proof-explanation
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