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New posts in proof-verification
Ordering the field of real rational functions
relations
order-theory
proof-verification
ordered-fields
Prove that the result of any nested composition of morphisms is independent of the placement of paranthesis.
proof-verification
category-theory
Please verify my proof of: There is no integer $\geq2$ sum of squares of whose digits equal the integer itself.
number-theory
elementary-number-theory
proof-verification
proof-writing
alternative-proof
Endomorphisms of forgetful functor $\mathbf{Grp}\to \mathbf{Set}$
category-theory
proof-verification
How to prove "Homotopy is an Equivalence Relation"
algebraic-topology
proof-verification
homotopy-theory
Cannot find a mistake in an incorrect proof.
elementary-set-theory
proof-verification
proof-writing
Why is $\int_{[0,1]} \frac{dw}{1-wz}$ is holomorphic in unit disc?
integration
complex-analysis
proof-verification
continuity
contour-integration
Prove for prime $p, \forall l \in \mathbb Z^+, a\equiv b\pmod {p}\nrightarrow a\equiv b\pmod {p^l}.$
elementary-number-theory
proof-verification
Planar graphs where every face boundary is a cycle of even length are bipartite
graph-theory
proof-verification
How many functions are possible to create in this example?
combinatorics
functions
discrete-mathematics
proof-verification
relations
Is my proof correct for: $\sqrt[7]{7!} < \sqrt[8]{8!}$
algebra-precalculus
proof-verification
alternative-proof
Prove that if $({x+\sqrt{x^2+1}})({y+\sqrt{y^2+1}})=1$ then $x+y=0$
algebra-precalculus
proof-verification
radicals
A group of order $595$ has a normal Sylow 17-subgroup.
proof-verification
sylow-theory
Proof of an inequality using analytic geometry
algebra-precalculus
proof-verification
inequality
proof-writing
analytic-geometry
For $a>0$ and $x_0\ge a$ prove that the sequence defined as $x_{n+1}=(x_n+a/x_n)/2$ decreases and converges to $\sqrt a$
sequences-and-series
proof-verification
If $f$ continuous and $\lim_{x\to-\infty }f(x)=\lim_{x\to\infty }f(x)=+\infty $ then $f$ takes its minimum.
real-analysis
proof-verification
Why is this proof false? $\sqrt 2 + \sqrt 6 < \sqrt 15$
proof-verification
If $2x + 3y$ is multiple of $17$, then $9x + 5y$ is multiple of $17$
elementary-number-theory
proof-verification
integers
Events that carry negative information
probability
proof-verification
proof-writing
Explicit proof of the derivative of a matrix logarithm
logarithms
proof-verification
matrix-calculus
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