corpus.blog
41554 blogs · [ { "id": "01a0c52c-5a6e-71d9-aa2b-70845e87a721", "title": "The product of four consecutive Fibonacci numbers equals the product of two consecutive integers: a proof", "url": "https://mathematicaloddsandends.wordpress.com/2026/09/17/the-product-of-four-consecutive-fibonacci-numbers-equals-the-product-of-two-consecutive-integers-a-proof/", "published_at": "2026-09-17T15:15:32+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe4d7ef4b", "title": "Abundant numbers", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/22/abundant-numbers/", "published_at": "2026-08-22T09:55:07+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe5bd9027", "title": "Evaluating \\zeta(2) and \\zeta(4) with Fourier series", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/09/evaluating-zeta2-and-zeta4-with-fourier-series/", "published_at": "2026-08-09T13:09:00+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe67fa6e6", "title": "An integral which evaluates to \\zeta(2)", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/09/an-integral-which-evaluates-to-zeta2/", "published_at": "2026-08-09T09:24:43+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe72a8c30", "title": "Integral representation of the zeta function", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/05/integral-representation-of-the-zeta-function/", "published_at": "2026-08-05T12:30:17+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe75d5ed5", "title": "A connection between Euler’s constant and the zeta function", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/02/a-connection-between-eulers-constant-and-the-zeta-function/", "published_at": "2026-08-02T12:14:00+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe7afab54", "title": "A generalization of the Gaussian integral", "url": "https://mathematicaloddsandends.wordpress.com/2026/08/02/a-generalization-of-the-gaussian-integral/", "published_at": "2026-08-02T08:47:53+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe7bfa1dd", "title": "The unique function with derivative equalling its inverse", "url": "https://mathematicaloddsandends.wordpress.com/2026/06/30/the-unique-function-with-derivative-equalling-its-inverse/", "published_at": "2026-06-30T15:55:00+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe899aa20", "title": "Brainteaser about evaluating an infinite product", "url": "https://mathematicaloddsandends.wordpress.com/2026/06/25/brainteaser-about-evaluating-an-infinite-product/", "published_at": "2026-06-26T01:47:47+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe94e94c3", "title": "What is the napkin ring problem?", "url": "https://mathematicaloddsandends.wordpress.com/2026/03/21/what-is-the-napkin-ring-problem/", "published_at": "2026-03-21T14:15:12+00:00" }, { "id": "01a087a1-70df-7131-93be-66dfe9db2f8e", "title": "What are Ford circles?", "url": "https://mathematicaloddsandends.wordpress.com/2025/11/18/what-are-ford-circles/", "published_at": "2025-11-18T14:13:43+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f775f8508", "title": "Some stochastic calculus notes", "url": "https://mathematicaloddsandends.wordpress.com/2025/08/22/some-stochastic-calculus-notes/", "published_at": "2025-08-23T03:08:59+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f77ab56df", "title": "A probability puzzle involving random fractions", "url": "https://mathematicaloddsandends.wordpress.com/2025/07/12/a-probability-puzzle-involving-random-fractions/", "published_at": "2025-07-12T15:28:20+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f782c0504", "title": "The Leibniz integral rule", "url": "https://mathematicaloddsandends.wordpress.com/2025/04/02/the-leibniz-integral-rule/", "published_at": "2025-04-03T00:51:27+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f79218611", "title": "The maximum number of equidistant points in R^n is…", "url": "https://mathematicaloddsandends.wordpress.com/2025/04/02/the-maximum-number-of-equidistant-points-in-rn-is-n1/", "published_at": "2025-04-02T17:14:30+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f7936be65", "title": "What is the Buenos Aires constant?", "url": "https://mathematicaloddsandends.wordpress.com/2025/02/20/what-is-the-buenos-aires-constant/", "published_at": "2025-02-20T15:44:19+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f798de9e1", "title": "A theorem on interpolation error bound", "url": "https://mathematicaloddsandends.wordpress.com/2024/09/11/a-theorem-on-interpolation-error-bound/", "published_at": "2024-09-11T22:20:03+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f79ff4230", "title": "What is Craig’s formula for the Gaussian Q-function?", "url": "https://mathematicaloddsandends.wordpress.com/2024/09/05/what-is-craigs-formula-for-the-gaussian-q-function/", "published_at": "2024-09-06T02:38:24+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f7a349364", "title": "Paint roller puzzle in R", "url": "https://mathematicaloddsandends.wordpress.com/2024/05/05/paint-roller-puzzle-in-r/", "published_at": "2024-05-05T14:11:56+00:00" }, { "id": "01a0bb54-13ed-712a-a15f-ca3f7a3ca19a", "title": "How to prove Maclaurin’s inequality and Newton’s inequality", "url": "https://mathematicaloddsandends.wordpress.com/2024/01/07/how-to-prove-maclaurins-inequality-and-newtons-inequality/", "published_at": "2024-01-08T06:23:52+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e2704f2d3d96", "title": "A quick proof of Sierpiński’s inequality", "url": "https://mathematicaloddsandends.wordpress.com/2024/01/06/a-quick-proof-of-sierpinskis-inequality/", "published_at": "2024-01-07T00:25:23+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e270500ed1aa", "title": "How many valid sudoku grids are there?", "url": "https://mathematicaloddsandends.wordpress.com/2023/12/27/how-many-valid-sudoku-grids-are-there/", "published_at": "2023-12-27T17:13:04+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e2705083496f", "title": "Some properties of f(x)=x log x", "url": "https://mathematicaloddsandends.wordpress.com/2023/10/15/some-properties-of-fxx-log-x/", "published_at": "2023-10-16T06:54:53+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e27050c7f8e2", "title": "Deriving the “Rule of 72” in finance", "url": "https://mathematicaloddsandends.wordpress.com/2023/10/10/deriving-the-rule-of-72-in-finance/", "published_at": "2023-10-11T04:21:10+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e270518d5bf8", "title": "Tests of divisibility for 13 and 17", "url": "https://mathematicaloddsandends.wordpress.com/2023/01/03/tests-of-divisibility-for-13-and-17/", "published_at": "2023-01-03T15:54:14+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e27051ed4b6f", "title": "Test of divisibility for 7", "url": "https://mathematicaloddsandends.wordpress.com/2022/12/30/test-of-divisibility-for-7/", "published_at": "2022-12-30T12:47:52+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e27052b617c6", "title": "What is a block-angular matrix?", "url": "https://mathematicaloddsandends.wordpress.com/2022/12/23/what-is-a-block-angular-matrix/", "published_at": "2022-12-23T22:21:14+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e27052efee43", "title": "What is the Birkhoff polytope?", "url": "https://mathematicaloddsandends.wordpress.com/2022/12/22/what-is-the-birkhoff-polytope/", "published_at": "2022-12-22T21:16:42+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e27053071b0e", "title": "Proof that the dual norm of the dual norm is the norm itself", "url": "https://mathematicaloddsandends.wordpress.com/2022/12/08/proof-that-the-dual-norm-of-the-dual-norm-is-the-norm-itself/", "published_at": "2022-12-09T07:27:16+00:00" }, { "id": "01a0bb5a-4433-7257-9f76-e270534dc905", "title": "Clearing up directional semi-derivatives for one dimension", "url": "https://mathematicaloddsandends.wordpress.com/2022/12/03/clearing-up-directional-semi-derivatives-for-one-dimension/", "published_at": "2022-12-03T16:59:09+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512eedda944", "title": "Generalizing projections to Mahalanobis-type metrics", "url": "https://mathematicaloddsandends.wordpress.com/2022/08/06/generalizing-projections-to-mahalanobis-type-metrics/", "published_at": "2022-08-07T06:08:23+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512ef790e0b", "title": "Rank and trace are equal for a real symmetric idempotent matrix", "url": "https://mathematicaloddsandends.wordpress.com/2022/08/05/rank-and-trace-are-equal-for-a-real-symmetric-idempotent-matrix/", "published_at": "2022-08-06T05:14:38+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f023a5b3", "title": "Conway’s fruitful fractions (or how to generate all the prime numbers by multiplying one of 14 fractions)", "url": "https://mathematicaloddsandends.wordpress.com/2022/04/08/conways-fruitful-fractions-or-how-to-generate-all-the-prime-numbers-by-multiplying-one-of-14-fractions/", "published_at": "2022-04-08T20:43:10+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f10457e1", "title": "Two ways to approximate the root of an equation involving a combinatorial sum", "url": "https://mathematicaloddsandends.wordpress.com/2022/03/27/two-ways-to-approximate-the-root-of-an-equation-involving-a-combinatorial-sum/", "published_at": "2022-03-28T05:33:09+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f1c49496", "title": "A proof of the Frobenius-König theorem", "url": "https://mathematicaloddsandends.wordpress.com/2022/02/28/a-proof-of-the-frobenius-konig-theorem/", "published_at": "2022-03-01T04:53:45+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f2556429", "title": "What is the permanent of a matrix?", "url": "https://mathematicaloddsandends.wordpress.com/2022/02/27/what-is-the-permanent-of-a-matrix/", "published_at": "2022-02-28T06:37:34+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f27f72b3", "title": "What is the Abel-Ruffini theorem?", "url": "https://mathematicaloddsandends.wordpress.com/2022/02/06/what-is-the-abel-ruffini-theorem/", "published_at": "2022-02-07T02:48:55+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f32cd3e4", "title": "What are Carmichael numbers / absolute pseudoprimes?", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/27/what-are-carmichael-numbers-absolute-pseudoprimes/", "published_at": "2022-01-28T05:00:39+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f350c11a", "title": "What is Hardy’s inequality?", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/19/what-is-hardys-inequality/", "published_at": "2022-01-20T05:00:25+00:00" }, { "id": "01a0bb62-5e14-72b5-aed5-a512f3d083fc", "title": "Proofs with majorant and minorant functions", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/16/proofs-with-majorant-and-minorant-functions/", "published_at": "2022-01-17T01:43:29+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b68f80daa", "title": "A J-convex (midpoint-convex) function which is not convex", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/15/a-j-convex-midpoint-convex-function-which-is-not-convex/", "published_at": "2022-01-16T05:36:56+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b69192da1", "title": "What is Lagrange’s identity?", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/13/what-is-lagranges-identity/", "published_at": "2022-01-14T05:14:04+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b69f00cf8", "title": "Proving the Cauchy-Schwarz inequality with induction", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/07/proving-the-cauchy-schwarz-inequality-with-induction/", "published_at": "2022-01-08T05:09:01+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b6a50a9aa", "title": "Estimating digits of pi with billiard balls", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/03/estimating-digits-of-pi-with-billiard-balls/", "published_at": "2022-01-04T05:36:13+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b6a6d32bc", "title": "7 riffle shuffles to randomize a deck of cards", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/01/7-riffle-shuffles-to-randomize-a-deck-of-cards/", "published_at": "2022-01-02T06:38:12+00:00" }, { "id": "01a0bb68-8a0b-729f-b740-732b6ab4fe28", "title": "A brainteaser involving prime sums and differences", "url": "https://mathematicaloddsandends.wordpress.com/2022/01/01/a-brainteaser-involving-prime-sums-and-differences/", "published_at": "2022-01-02T00:07:32+00:00" } ] posts Claim your blog
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2026

The product of four consecutive Fibonacci numbers equals the product of two consecutive integers: a prooforiginal ↗
17 Sept 2026
Abundant numbersoriginal ↗
22 Aug 2026
Evaluating \zeta(2) and \zeta(4) with Fourier seriesoriginal ↗
9 Aug 2026
An integral which evaluates to \zeta(2)original ↗
9 Aug 2026
Integral representation of the zeta functionoriginal ↗
5 Aug 2026
A connection between Euler’s constant and the zeta functionoriginal ↗
2 Aug 2026
A generalization of the Gaussian integraloriginal ↗
2 Aug 2026
The unique function with derivative equalling its inverseoriginal ↗
30 Jun 2026
Brainteaser about evaluating an infinite productoriginal ↗
26 Jun 2026
What is the napkin ring problem?original ↗
21 Mar 2026

2025

What are Ford circles?original ↗
18 Nov 2025
Some stochastic calculus notesoriginal ↗
23 Aug 2025
A probability puzzle involving random fractionsoriginal ↗
12 Jul 2025
The Leibniz integral ruleoriginal ↗
3 Apr 2025
The maximum number of equidistant points in R^n is…original ↗
2 Apr 2025
What is the Buenos Aires constant?original ↗
20 Feb 2025

2024

A theorem on interpolation error boundoriginal ↗
11 Sept 2024
What is Craig’s formula for the Gaussian Q-function?original ↗
6 Sept 2024
Paint roller puzzle in Roriginal ↗
5 May 2024
How to prove Maclaurin’s inequality and Newton’s inequalityoriginal ↗
8 Jan 2024
A quick proof of Sierpiński’s inequalityoriginal ↗
7 Jan 2024

2023

How many valid sudoku grids are there?original ↗
27 Dec 2023
Some properties of f(x)=x log xoriginal ↗
16 Oct 2023
Deriving the “Rule of 72” in financeoriginal ↗
11 Oct 2023
Tests of divisibility for 13 and 17original ↗
3 Jan 2023

2022

Test of divisibility for 7original ↗
30 Dec 2022
What is a block-angular matrix?original ↗
23 Dec 2022
What is the Birkhoff polytope?original ↗
22 Dec 2022
Proof that the dual norm of the dual norm is the norm itselforiginal ↗
9 Dec 2022
Clearing up directional semi-derivatives for one dimensionoriginal ↗
3 Dec 2022
Generalizing projections to Mahalanobis-type metricsoriginal ↗
7 Aug 2022
Rank and trace are equal for a real symmetric idempotent matrixoriginal ↗
6 Aug 2022
Conway’s fruitful fractions (or how to generate all the prime numbers by multiplying one of 14 fractions)original ↗
8 Apr 2022
Two ways to approximate the root of an equation involving a combinatorial sumoriginal ↗
28 Mar 2022
A proof of the Frobenius-König theoremoriginal ↗
1 Mar 2022
What is the permanent of a matrix?original ↗
28 Feb 2022
What is the Abel-Ruffini theorem?original ↗
7 Feb 2022
What are Carmichael numbers / absolute pseudoprimes?original ↗
28 Jan 2022
What is Hardy’s inequality?original ↗
20 Jan 2022
Proofs with majorant and minorant functionsoriginal ↗
17 Jan 2022
A J-convex (midpoint-convex) function which is not convexoriginal ↗
16 Jan 2022
What is Lagrange’s identity?original ↗
14 Jan 2022
Proving the Cauchy-Schwarz inequality with inductionoriginal ↗
8 Jan 2022
Estimating digits of pi with billiard ballsoriginal ↗
4 Jan 2022
7 riffle shuffles to randomize a deck of cardsoriginal ↗
2 Jan 2022
A brainteaser involving prime sums and differencesoriginal ↗
2 Jan 2022