Intereting Posts

Permutations and Combinations? 3 digit number…
Products of quotient topology same as quotient of product topology
Reduction from Hamiltonian cycle to Hamiltonian path
probability of rolling at least $n$ on $k$ 6-sided dice
Projection of the third dual of a Banach space onto the first dual
$\mathbb{Q}/(X^2+Y^2-1)$ is integrally closed
how to prove this combinatorial identity I accidentally find?
Calculate $\int^{n+1}_1 \frac{(\{x\})^{}}{}dx$ where $n\in\mathbb{N}$, $$ is the integer part of $x$ and $\left\{ x\right\} =x-$.
What is the greatest integer that divides $p^4-1$ for every prime number $p$ greater than $5$?
Finding the singularity type at $z=0$ of $\frac{1}{\cos(\frac{1}{z})}$
Strength of the statement “$\mathbb R$ has a Hamel basis over $\mathbb Q$”
How to prove $\cos\left(\pi\over7\right)-\cos\left({2\pi}\over7\right)+\cos\left({3\pi}\over7\right)=\cos\left({\pi}\over3 \right)$
Limit of a recursive sequence $s_n = (1-\frac{1}{4n^2})s_{n-1}$
A book for self-study of matrix decompositions
Length of Chord is Independent of Point P

Given list of quadrilaterals (from image processing), are there any properties/calculations that can filter out those that are not perspective projection of a target rectangle of **specific aspect ratio**?

For example, **a square** cannot be the image of **an A4 paper**. Can we generalize this concept to filter out more quadrilaterals?

- Algorithm to find the point in a convex polygon closest to an external point
- Volume of n-dimensional convex hull
- closest pair in N-Dimensional
- Expected Number of Convex Layers and the expected size of a layer for different distributions
- Prove ( or disprove) that for all kinds of simple polygon, the centroid lies inside the polygon
- Fitting data to a portion of an ellipse or conic section

- Points in general position
- Ackermann Function primitive recursive
- Finding the 2,147,483,647th prime number
- The disease problem
- Relatively prime property verification
- Why do we believe the Church-Turing Thesis?
- my plane is not vertical, How to update 3D coordinate of point cloud to lie on a 3D vertical plane
- The Entscheidungsproblem and the notion of decidability in first order logic
- filling an occluded plane with the smallest number of rectangles
- Point reflection over a line

- Sum of Stirling numbers of both kinds
- Do endomorphisms of infinite-dimensional vector spaces over algebraically closed fields always have eigenvalues?
- How to prove that this series is a metric: $d(x,y):=\sum_{i=0}^\infty \frac{|x_i -y_i|}{2^i (1+|x_i-y_i|)}$
- Ordered set partitions
- Reed Solomon Polynomial Generator
- Finding an $f(x)$ that satisfies $f(f(x)) = 4 – 3x$
- integrate $\int \frac{1}{e^{x}+e^{ax}+e^{a^{2}x}} \, dx$
- If $n,k\in\mathbb N$, solve $3^k-1=x^n$.
- Simple second order differential equation of the form $f''(x)+ h(x) = 0$
- Hard Definite integral involving the Zeta function
- Does a Dedekind cut define a real number into existence?
- Is the condition “sample paths are continuous” an appropriate part of the “characterization” of the Wiener process?
- Is there a commutative operation for which the inverse of the operation is also commutative?
- Does $R$ a domain imply $\operatorname{gr}(R)$ is a domain?
- Minimum distance between two parabolas