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proof writing related issues & queries in MathXchanger
Proving that $y_n$ converges given $y_{2n}, y_{2n+1}$ converges
real-analysis
proof-verification
convergence
Updated February 17, 2019 21:20 PM
0
answers
14
views
0
votes
Is my proof that $\overline{A}\cup\overline{B} = \overline{A\cup B}$ correct?
general-topology
proof-verification
Updated February 17, 2019 20:20 PM
4
answers
35
views
1
votes
(0,n) can't map to (0,1) without dividing by some f(n).
proof-writing
mapping-class-group
Updated February 17, 2019 20:20 PM
1
answers
6
views
0
votes
Integrate $\int_{|z|=1}z^{3}e^{1/z}dz$ - verification
complex-analysis
proof-verification
complex-integration
cauchy-integral-formula
Updated February 17, 2019 19:20 PM
1
answers
14
views
0
votes
Translating set syntax in FOL
elementary-set-theory
proof-explanation
definition
first-order-logic
quantifiers
Updated February 17, 2019 18:20 PM
1
answers
8
views
0
votes
Modular multiplicative inverse proof
elementary-number-theory
proof-writing
modular-arithmetic
Updated February 17, 2019 17:20 PM
1
answers
13
views
0
votes
Integrate $\int_{|z|=1/2}\frac{e^{1-z}}{z^{3}(1-z)}dz$ verification
complex-analysis
proof-verification
complex-integration
cauchy-integral-formula
Updated February 17, 2019 17:20 PM
0
answers
7
views
0
votes
Prove the equivalent conditions for nowhere dense subset.
general-topology
proof-verification
metric-spaces
nowhere-dense
Updated February 17, 2019 15:20 PM
1
answers
19
views
0
votes
Show that $a_{k-1}a_{k+1}\le a_k^2$ where $P(x) = \sum_{k=0}^n a_k X^k$ is a real polynomial with real roots, and $0<k<n$
polynomials
alternative-proof
Updated February 17, 2019 14:20 PM
1
answers
30
views
1
votes
An inequality about borel measures in a proof
measure-theory
proof-verification
Updated February 17, 2019 14:20 PM
0
answers
19
views
1
votes
What are the theorems in mathematics which can be proved using completely different ideas?
reference-request
big-list
alternative-proof
Updated February 17, 2019 14:20 PM
13
answers
1187
views
42
votes
How many different subsets $Y \subset X$ with $|Y| \leq n$ are there if $|X| = 2n+1$? (Elegant solution?)
combinatorics
proof-verification
Updated February 17, 2019 13:20 PM
0
answers
6
views
0
votes
Show that $T$ has an adjoint, and describe $T^*$ explicitly.
linear-algebra
proof-verification
adjoint-operators
Updated February 17, 2019 13:20 PM
0
answers
9
views
1
votes
Inversion lemma proof
proof-explanation
proof-theory
Updated February 17, 2019 12:20 PM
0
answers
5
views
0
votes
Is the integral of a smooth function on a closed smooth real manifold finite?
proof-verification
smooth-manifolds
smooth-functions
Updated February 17, 2019 11:20 AM
0
answers
7
views
2
votes
Proof that continuous curve in $\mathbb{R}^2$ has Lebesgue measure zero
real-analysis
measure-theory
proof-verification
lebesgue-measure
Updated February 17, 2019 07:20 AM
0
answers
12
views
2
votes
Proof that if $A \subseteq B \setminus C$ then $A$ and $C$ are disjoint.
proof-verification
elementary-set-theory
proof-writing
Updated February 17, 2019 07:20 AM
0
answers
4
views
0
votes
Prove $ x^n-1=(x-1)(x^{n-1}+x^{n-2}+...+x+1)$
elementary-number-theory
proof-writing
Updated February 17, 2019 06:20 AM
2
answers
24529
views
3
votes
Every uncountable closed set contains a perfect subset
real-analysis
proof-verification
Updated February 17, 2019 05:20 AM
0
answers
9
views
0
votes
What will be the notion of a "valid deduction" in the following system?
logic
propositional-calculus
proof-theory
Updated February 17, 2019 04:20 AM
0
answers
3
views
0
votes
Prove an inequality, using existing AM GM inequality
algebra-precalculus
proof-verification
a.m.-g.m.-inequality
Updated February 17, 2019 02:20 AM
2
answers
18
views
1
votes
Solution verification: Writing a sum in the Cantor normal form
sequences-and-series
proof-verification
set-theory
ordinals
Updated February 17, 2019 02:20 AM
0
answers
11
views
1
votes
Find $T^* $, where $T$ be the linear operator defined by $T \epsilon_1 = (1, - 2), \,\,T\epsilon_2 (i, - 1)$.
linear-algebra
proof-verification
adjoint-operators
Updated February 17, 2019 02:20 AM
0
answers
6
views
1
votes
No continuous function $f$ on $\mathbb{R}$ such that $f(x)=1_{[0,1]}(x)$ almost everywhere
real-analysis
measure-theory
proof-verification
lebesgue-measure
Updated February 17, 2019 01:20 AM
0
answers
20
views
0
votes
Let ST be a chord of a circle ω which is not a diameter, and let A be a fixed point on ST
geometry
proof-verification
euclidean-geometry
circle
Updated February 17, 2019 00:20 AM
1
answers
10
views
1
votes
For any starting point $x^{(0)}$ the basic conjugate algorithm converges to the unique $x^{*}$ in $n$ steps
linear-algebra
optimization
proof-explanation
gradient-descent
Updated February 16, 2019 22:20 PM
1
answers
8
views
0
votes
Explanation of the steps of this example, where there is no linear functional satisfying $f (\alpha ) = (\alpha | \beta)$
linear-algebra
proof-explanation
Updated February 16, 2019 22:20 PM
1
answers
11
views
0
votes
why $e=e_2+v_i^2+\sum_{j=0}^{\sigma(G)}(i-j)\beta_{ij}(p)$
graph-theory
proof-explanation
ramsey-theory
Updated February 16, 2019 20:20 PM
0
answers
4
views
0
votes
Diagonalizable Matrix $A$ with Eigenvalues scalar=c, is $A=cI$
matrices
proof-writing
eigenvalues-eigenvectors
matrix-analysis
Updated February 16, 2019 19:20 PM
2
answers
12
views
0
votes
Verify that $f(x)=\frac{1}{x}-\frac{1}{x_0}$ is continuous for every $x_0\neq 0$.
real-analysis
proof-verification
continuity
Updated February 16, 2019 18:20 PM
0
answers
20
views
0
votes
Direct proof of Archimedean Property (not by contradiction)
real-analysis
analysis
real-numbers
alternative-proof
Updated February 16, 2019 17:20 PM
1
answers
8
views
1
votes
Least-Upper-Bound Property $\implies$ Greatest-Lower Bound Property (Rudin)
real-analysis
proof-explanation
supremum-and-infimum
Updated February 16, 2019 15:20 PM
2
answers
133
views
1
votes
A question on the equality between two sets.
proof-verification
Updated February 16, 2019 11:20 AM
2
answers
16
views
1
votes
proof verification of tirivial fundamental group.
proof-verification
algebraic-topology
homotopy-theory
fundamental-groups
Updated February 16, 2019 10:20 AM
0
answers
3
views
0
votes
$\int_0^{+\infty} f(x) dx = - \lim_{a\rightarrow 0^+} \frac{1}{a} \sum Res_{\Bbb{C} \setminus \Bbb{R}^+} (f(z)z^a)$?
complex-analysis
proof-verification
analytic-functions
Updated February 16, 2019 09:20 AM
0
answers
11
views
0
votes
Have I proved in ZF $\aleph (X) \lt \aleph (\mathscr P^3(X))$?
proof-verification
set-theory
axiom-of-choice
Updated February 16, 2019 06:20 AM
0
answers
6
views
0
votes
Theorem: $e_2\leq (y-1)[\frac{n}{2}-y+1+i]$
graph-theory
proof-explanation
ramsey-theory
Updated February 16, 2019 04:20 AM
0
answers
18
views
0
votes
Is this a typo about the derived set in textbook Introduction to Set Theory by Hrbacek and Jech?
elementary-set-theory
proof-explanation
ordinals
Updated February 16, 2019 03:20 AM
1
answers
21
views
-1
votes
If |x + y| > |x - y|, then how to arrive at $xy > 0$?
algebra-precalculus
inequality
absolute-value
alternative-proof
Updated February 16, 2019 02:20 AM
2
answers
27
views
1
votes
How to justify the unique existence of this sequence by Transfinite Recursion Theorem?
sequences-and-series
proof-verification
elementary-set-theory
ordinals
Updated February 16, 2019 01:20 AM
0
answers
24
views
1
votes
Proof verification using Schwarz Lemma
complex-analysis
proof-verification
inequality
Updated February 16, 2019 01:20 AM
0
answers
13
views
0
votes
First orderer logic completeness and independence: the proof that disappear?
first-order-logic
independence
proof-theory
Updated February 15, 2019 23:20 PM
0
answers
7
views
1
votes
Understanding the proof $C(X)$ is complete
general-topology
functional-analysis
proof-writing
proof-explanation
Updated February 15, 2019 22:20 PM
0
answers
20
views
0
votes
Find an orthonormal basis in which $E$ is represented by matrix
linear-algebra
proof-verification
Updated February 15, 2019 21:20 PM
1
answers
8
views
1
votes
Is it correct to write $(a,b,c) < d$?
notation
article-writing
Updated February 15, 2019 17:20 PM
1
answers
21
views
1
votes
An inequality about compact functions and lsc functions
real-analysis
measure-theory
proof-explanation
semicontinuous-functions
Updated February 15, 2019 16:20 PM
0
answers
5
views
0
votes
If $Ha\subseteq Kb$ for some $a,b\in G$, show that $H \subseteq K$.
group-theory
proof-verification
Updated February 15, 2019 16:20 PM
1
answers
111
views
4
votes
Why is this the optimal value of the dual problem?
proof-explanation
convex-optimization
Updated February 15, 2019 13:20 PM
0
answers
6
views
0
votes
Autonomous system of ODEs: Using Picard-Lindelöf after transforming to multiple non-autonomous ODEs
ordinary-differential-equations
proof-verification
Updated February 15, 2019 11:20 AM
0
answers
5
views
0
votes
Conditional Probability Problem about ientical twins
probability
proof-verification
Updated February 15, 2019 11:20 AM
0
answers
5
views
1
votes
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