David Ellsworth

David Ellsworth maintains the Squares in Squares catalogue, extending Friedman’s records with SVG drawings, high-precision values and algebraic descriptions. He also develops packing parsers and checking tools.

Years active
2024–2026

Resources

WebsiteSquares in Squares

By David Ellsworth after Friedman

kingbird.myphotos.cc/packing/squares_in_squares.htmlThe catalogue of record packings, with their exact sides and histories: the baseline of every upper bound here.

2 results (at S2)

2 results (at S2) · 0 records · 28 credits (1 at S4, 21 at S3, 4 at S2, 2 at S1)

Results

  • T-088 (upper bound, n = 69): source author, credited contributor — Ellsworth, in [Ellsworth n69 2026-09-24]
  • T-089 (upper bound, n = 83, 87): source author, credited contributor, prerequisite — Ellsworth, in [Chang n83 2026-09-24]; [Chang n87 2026-09-24]

Credited work

Credits: 28
  • T-098 (upper bound, 48 cases, n = 68 to 307): prerequisite — Ellsworth, in [evand exact optima 2026-10-05]
  • T-101 (upper bound, 77 cases, n = 28 to 300): prerequisite — Ellsworth, in [evand exact optima 2026-10-05]
  • T-113 (upper bound, 10 cases, n = 108 to 303): prerequisite — Ellsworth, in [SQUISH ten packings 2026-10-07]
  • T-114 (upper bound, n = 153): prerequisite — Ellsworth, in [SQUISH n153 2026-10-07] (Source: #401)
  • T-115 (upper bound, 12 cases, n = 123 to 263): prerequisite — Ellsworth, in [SQUISH update 2026-10-07]
  • T-116 (upper bound, 9 cases, n = 88 to 302): prerequisite — Ellsworth, in [SQUISH second update 2026-10-07]
  • T-119 (upper bound, n = 266, 270, 272): prerequisite — Ellsworth, in [Daniel new arrangements 2026-10-07] (Registered in: #441)
  • T-128 (upper bound, 8 cases, n = 105 to 306): prerequisite — Ellsworth, in [Couzo exact refinements 2026-10-08] (Registered in: #487 · #478)
  • T-130 (upper bound, 5 cases, n = 84 to 270): prerequisite — Ellsworth, in [Couzo follow-up refinements 2026-10-08] (Registered in: #487)
  • T-134 (upper bound, 6 cases, n = 132 to 303): prerequisite — Ellsworth, in [Couzo exact certificates 2026-10-09] (Registered in: #487)
  • T-135 (upper bound, n = 308): prerequisite — Ellsworth, in [Fang two-wedge certificates 2026-10-10] (Registered in: #487)
  • T-136 (upper bound, 17 cases, n = 131 to 307): prerequisite — Ellsworth, in [SQUISH third request 2026-10-09] (Registered in: #487)
  • T-138 (upper bound, 16 cases, n = 84 to 306): prerequisite — Ellsworth, in [Mishapolk decimal poses 2026-10-09] (Registered in: #487)
  • T-140 (upper bound, 6 cases, n = 132 to 305): prerequisite — Ellsworth, in [Couzo certificates 2026-10-10] (Registered in: #487)
  • T-151 (upper bound, 9 cases, n = 176 to 305): prerequisite — Ellsworth, in [SQUISH fourth request 2026-10-11] (Registered in: #553)
  • T-152 (upper bound, n = 304, 305): prerequisite — Ellsworth, in [Couzo certificates 2026-10-11] (Registered in: #553)
  • T-158 (upper bound, n = 175, 232, 264): prerequisite — Ellsworth, in [Ostashev records 2026-10-12] (Registered in: #598)
  • T-161 (upper bound, n = 156, 176, 237, 271): prerequisite — Ellsworth, in [Couzo certificates 2026-10-12] (Registered in: #614 · #602)
  • T-163 (upper bound, n = 211, 241, 273, 307): prerequisite — Ellsworth, in [Fang excess theorem 2026-10-13] (Registered in: #602)
  • T-165 (upper bound, n = 176): prerequisite — Ellsworth, in [Couzo certificates 2026-10-13] (Registered in: #614 · #602)
  • T-172 (upper bound, n = 154): prerequisite — Ellsworth, in [Couzo issue-583 certificates 2026-10-13] (Registered in: #614 · #602)
  • T-174 (upper bound, 68 cases, n = 68 to 308): prerequisite — Ellsworth, in [PingYou PR 574 certificates 2026-10-13] (Registered in: #614 · #602)
  • T-181 (upper bound, n = 211, 241, 302): prerequisite — Ellsworth, in [Couzo certificates 2026-10-13]; [Couzo issue-583 certificates 2026-10-13] (Registered in: #614 · #602)
  • T-182 (upper bound, n = 154, 211, 241): prerequisite — Ellsworth, in [Couzo certificates 2026-10-13] (Registered in: #614 · #602)
  • T-183 (upper bound, n = 237): prerequisite — Ellsworth, in [Mishapolk records 2026-10-14] (Registered in: #614 · #602)
  • T-185 (upper bound, n = 175): prerequisite — Ellsworth, in [Couzo n175 2026-10-11]
  • T-189 (upper bound, n = 237): prerequisite — Ellsworth, in [Couzo certificates 2026-10-14]
  • T-195 (upper bound, n = 29): prerequisite — Ellsworth, in [PingYou PR 622 certificate 2026-10-15]

Other reviewed records

Reviewed records: 27
  • n = 28: construction finder — David Ellsworth
  • n = 29: construction improver — David Ellsworth
  • n = 53: construction improver — David Ellsworth
  • n = 55: construction improver — David Ellsworth
  • n = 69: construction improver — David Ellsworth
  • n = 83: construction improver — David Ellsworth
  • n = 87: construction finder — David Ellsworth
  • n = 87: construction improver — David Ellsworth
  • n = 128: construction finder — David Ellsworth
  • n = 128: construction improver — David Ellsworth
  • n = 150: construction finder — David Ellsworth
  • n = 151: construction finder — David Ellsworth
  • n = 171: construction finder — David Ellsworth
  • n = 203: construction finder — David Ellsworth
  • n = 205: construction finder — David Ellsworth
  • n = 205: construction improver — David Ellsworth
  • n = 230: construction finder — David Ellsworth
  • n = 234: construction finder — David Ellsworth
  • n = 234: construction improver — David Ellsworth
  • n = 235: construction finder — David Ellsworth
  • n = 257: construction finder — David Ellsworth
  • n = 293: construction finder — David Ellsworth
  • n = 300: construction finder — David Ellsworth
  • n = 300: construction improver — David Ellsworth
  • [Kingbird]: source author — Ellsworth
  • [griffcass square-packing 2026-09-23]: prerequisite — Ellsworth
  • [Daniel compositions 2026-10-13]: prerequisite — Ellsworth

Related News

Sources

Biography sources: catalogue-byline, tools-credit

  1. catalogue-byline: Page header: “SVG, high-precision, and other updates by David Ellsworth”, the name linked to https://github.com/Davidebyzero, “based on original compiled by Erich Friedman”; the parse_svg_packing.py link names github.com/Davidebyzero/packing_squares_in_squares__tools.
  2. catalogue-credits: Entry credit lines naming David Ellsworth, such as entry 28, “Found by David Ellsworth in December 2025”, and entry 87, “Found by David Ellsworth in December 2024”; the case records read found_by and improved_by from these lines.
  3. picture-credits: The n = 17 credits read from the catalogue SVG: “Exact polynomial root solution by David Ellsworth on June 4, 2023”, confirmed independently by Boris Alexeev the same day.
  4. tools-credit: Credits section: the catalogue “maintained by David Ellsworth”, and Ellsworth’s parsing and checking tools at https://github.com/Davidebyzero/packing_squares_in_squares__tools.
  5. bibliography: credited_names maps David Ellsworth to Ellsworth; the [Kingbird] entry quotes the page header naming him.

Identity evidence