Recent changes

A transparent log of recent article and problem edits.

problemProbability of commuting in a finite group

6/21/2026, 1:29:01 AM

Problem edited

@ancient-tree

problemSome bounded sequences that always converge

6/20/2026, 7:16:52 PM

Problem created

@sequoia

problemProbability of commuting in a finite group

6/20/2026, 5:58:55 PM

Problem edited

@sequoia

problemA cow issue

6/20/2026, 5:58:26 PM

Problem created

@sequoia

problemProbability of commuting in a finite group

6/20/2026, 5:55:33 PM

Problem created

@sequoia

problemLimit of a sum of periodic functions

6/20/2026, 5:13:14 PM

Problem created

@ancient-tree

problemGroups with 3 conjugacy classes

6/20/2026, 2:08:48 PM

Problem created

@ancient-tree

problemGrid walks with diagonal steps

6/20/2026, 2:00:04 PM

Problem deleted

@ancient-tree

problemProducts that appear more than once

6/20/2026, 1:57:40 PM

Problem deleted

@ancient-tree

problemWhat can three coin values make?

6/20/2026, 1:57:15 PM

Problem deleted

@ancient-tree

problemRectangles whose area equals their perimeter

6/20/2026, 1:57:08 PM

Problem deleted

@ancient-tree

problemHidden fractions

6/20/2026, 1:56:31 PM

Problem edited

@ancient-tree

problemA small game of taking stones

6/20/2026, 1:54:04 PM

Problem deleted

@ancient-tree

problemHow many borders can a small island have?

6/20/2026, 1:53:57 PM

Problem deleted

@ancient-tree

problemIntegers as consecutive sums

6/20/2026, 1:51:16 PM

Problem edited

@ancient-tree

problemIntegers as consecutive sums

6/20/2026, 1:50:50 PM

Problem edited

@ancient-tree

problemIntegers as consecutive sums

6/20/2026, 1:49:25 PM

Problem edited

@ancient-tree

problemThe two-digit reverse experiment

6/20/2026, 1:34:46 PM

Problem deleted

@ancient-tree

problemAverages that stay whole

6/20/2026, 1:34:34 PM

Problem deleted

@ancient-tree

problemA perplexity of eggs

6/20/2026, 1:22:58 PM

Problem created

@ancient-tree

problemBinomial coefficient identity with a bijection

6/20/2026, 12:50:53 PM

Problem edited

@ancient-tree

problemBinomial coefficient identity with a bijection

6/20/2026, 12:30:51 PM

Problem edited

@ancient-tree

problemBinomial coefficient identity with a bijection

6/20/2026, 12:30:25 PM

Problem edited

@ancient-tree

problemBinomial coefficient identity with a bijection

6/20/2026, 12:29:52 PM

Problem edited

@ancient-tree

problemBinomial coefficient identity with a bijection

6/20/2026, 12:27:58 PM

Problem created

@ancient-tree

problemA price goes up and then down

6/20/2026, 12:05:42 PM

Problem edited

@ancient-tree

problemDeterminant of a matrix with consecutive integers

6/18/2026, 6:54:37 AM

Problem created

@ancient-tree

problemEndomorphism with all eigenvectors

6/17/2026, 7:10:41 PM

Problem edited

@ancient-tree

conceptEndomorphism

6/17/2026, 3:05:31 PM

Concept created

@ancient-tree

problemEndomorphism with all eigenvectors

6/17/2026, 12:36:34 PM

Problem created

@ancient-tree

problemA diagonalizable matrix ?

6/16/2026, 9:47:20 PM

Problem edited

@ancient-tree

problemA diagonalizable matrix ?

6/16/2026, 9:46:53 PM

Problem created

@ancient-tree

problemFour consecutive integers

6/14/2026, 4:50:52 PM

Starter problem created

@ancient-tree

problemA price goes up and then down

6/14/2026, 4:46:30 PM

Starter problem created

@ancient-tree

problemHow many borders can a small island have?

6/14/2026, 4:40:46 PM

Starter problem created

@ancient-tree

problemAverages that stay whole

6/14/2026, 4:40:46 PM

Starter problem created

@ancient-tree

problemRectangles whose area equals their perimeter

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemGrid walks with diagonal steps

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemThe two-digit reverse experiment

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemWhat can three coin values make?

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemProducts that appear more than once

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemHidden fractions

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemA small game of taking stones

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree

problemIntegers as consecutive sums

6/14/2026, 4:40:45 PM

Starter problem created

@ancient-tree