Ivan Shishkin, Rye (1878)

Problems

48 problems / 21 domains

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Showing 48 problems

14

Slicing chocolate bars

Other · 0 solved · Unreviewed

by Ancient Tree
0
37

Discrete topological manifolds

General topology · 0 solved · Unreviewed

by Ancient Tree
0
35

A cyclic system of congruences

Number theory · 0 solved · Reviewed

by Ancient Tree
0
39

Quotient of a group and subgroup

Algebra · 1 solved · Reviewed

by Ancient Tree
1
14

A simpler Pythagorean theorem

Geometry · spoiler domain hidden · 0 solved · Unreviewed

by Ancient Tree
1
05

Fraction over 100

Algebra · 3 solved · Reviewed

by Ancient Tree
0
24

Eigenvalues of orthogonal matrices

Linear algebra · 1 solved · Reviewed

by Ancient Tree
0
25

Eigenvalues of a weird matrix

Other · 1 solved · Reviewed

by Ancient Tree
0
42

Is the parabola reducible ?

Algebraic geometry · 0 solved · Unreviewed

by Ancient Tree
0
59

An equation solvable by radicals ?

Algebra · 0 solved · Unreviewed

by Ancient Tree
0
42

7-adic year

Number theory · Real analysis · 0 solved · Unreviewed

by Ancient Tree
0
22

Magnitude of a root of a polynomial

Algebra · 1 solved · Reviewed

by Ancient Tree
1
51

Determinant of a gcd matrix

Linear algebra · Number theory · 1 solved · Reviewed

by Ancient Tree
1
26

Real roots and derivative polynomial

Algebra · 1 solved · Reviewed

by Ancient Tree
0
17

Roots of the derivative of a quadratic polynomial

Algebra · 1 solved · Reviewed

by Ancient Tree
0
32

Interior of a vector subspace

Linear algebra · 1 solved · Reviewed

by Ancient Tree
0
52

Ring with cubic elements

Algebra · 0 solved · Unreviewed

by Ancient Tree
0
30

A reasoning on compactness

General topology · 1 solved · Reviewed

by Ancient Tree
0
21

Middle or sides ?

Probability and statistics · 1 solved · Reviewed

by Ancient Tree
0
12

An intimidating tower

Number theory · 1 solved · Reviewed

Trick question
by Ancient Tree
0
20

An unfamiliar inner product

Real analysis · Functional analysis · 1 solved · Reviewed

by Ancient Tree
1
40

Functor between integers with divisibility and groups

Category theory · 1 solved · Unreviewed

by Ancient Tree
0
45

Groups of order 2026

Algebra · 1 solved · Reviewed

by Ancient Tree
0
20

Periodic function with a limit

Real analysis · 1 solved · Reviewed

by Ancient Tree
0
35

Groups of order 6

Representation theory · 0 solved · Unreviewed

by Ancient Tree
0
15

Divisibility of an even number

Number theory · 1 solved · Unreviewed

by Ancient Tree
0
12

Consecutive integers and divisibility

Number theory · 1 solved · Reviewed

by Ancient Tree
0
38

Finite groups with 2 conjugacy classes

Algebra · 1 solved · Reviewed

by Ancient Tree
0
24

Groups with a single conjugacy class

Other · 1 solved · Reviewed

by Ancient Tree
0
10

Even-odd equality

Number theory · 1 solved · Reviewed

by Ancient Tree
0
60

Sine of a divisor of π

Algebra · 0 solved · Unreviewed

by Ancient Tree
1
10

Rationality of the golden ratio

Algebra · 1 solved · Reviewed

by Ancient Tree
0
25

Groups of order 41

Representation theory · 1 solved · Reviewed

by Ancient Tree
1
50

Number of solutions of a Diophantine equation

Number theory · 1 solved · Reviewed

Diophantine equation
by Ancient Tree
0
29

Fixed points of a direct isometry

Algebra · 0 solved · Unreviewed

determinantfixed pointisometryrotation
by Ancient Tree
0
12

Linear maps of rank 0

Algebra · 1 solved · Reviewed

by Ancient Tree
0
10

Roots of a quadratic equation with a parameter

Algebra · 1 solved · Reviewed

polynomialquadratic equationroots
by Ancient Tree
0
60

Limit of a sum of periodic functions

Real analysis · 1 solved · Reviewed

limitperiodic functions
by Ancient Tree
0
51

Finite groups with 3 conjugacy classesFeatured

Algebra · 0 solved · Reviewed

conjugacy classesgroup
by Ancient Tree
1
04

A perplexity of eggs

Number theory · 1 solved · Unreviewed

by Ancient Tree
0
35

Binomial coefficient identity with a bijection

Combinatorics · 1 solved · Reviewed

bijectionbinomial coefficients
by Ancient Tree
0
29

Determinant of a matrix with consecutive integers

Other · 1 solved · Reviewed

determinantmatrix
by Ancient Tree
0
10

Endomorphism with all eigenvectors

Algebra · 1 solved · Reviewed

eigenvectors
by Ancient Tree
0
09

A diagonalizable matrix ?

Algebra · 1 solved · Reviewed

by Ancient Tree
0
08

Four consecutive integers

Algebra · 1 solved · Reviewed

algebrafactorizationidentitiesintegers
by Ancient Tree
0
05

A price goes up and then down

Number theory · 2 solved · Reviewed

percentages
by Ancient Tree
0
05

Hidden fractions

Algebra · 2 solved · Reviewed

fractions
by Ancient Tree
0
35

Integers as consecutive sums

Number theory · 2 solved · Reviewed

by Ancient Tree
2