Verified Facts — Post 15: Three Mathematicians from Poznan
Verified Facts — Post 15: Three Mathematicians from Poznan
Fact-check pass on _posts/2026-04-12-Three-mathematicians-from-Poznan.md.
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Biographical — Marian Rejewski
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Born 16 August 1905 in Bromberg/Bydgoszcz | VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | High | Matches post |
| Father Jozef a tobacco merchant | UNVERIFIED in primary Wikipedia article | https://en.wikipedia.org/wiki/Marian_Rejewski | Medium | Widely repeated; not in Wikipedia lead — likely correct from Kozaczuk biography |
| Studied mathematics at University of Poznan | VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Poznan cryptology course January 1929 | VERIFIED (specifically 15 January 1929) | https://en.wikipedia.org/wiki/Marian_Rejewski | High | Post says “January 1929” — correct |
| Year at University of Gottingen | PARTIALLY VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | Medium | He began a two-year actuarial-statistics course in summer 1930 and left after one year |
| Started full-time at Cipher Bureau (Biuro Szyfrow), Warsaw, on 1 September 1932 | VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | High | Matches post exactly |
| Worked under Captain Maksymilian Ciezki | VERIFIED (head of German section) | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Was 27 when he broke Enigma in late 1932 | VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Officer’s Cross Polonia Restituta 1978 | VERIFIED (12 August 1978) | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Son Andrzej died of polio in 1947, age 11, after 5 days’ illness | VERIFIED | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Died of heart attack 13 February 1980 in Warsaw | VERIFIED (date and place) | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| Died “while returning from shopping” | NOT in Wikipedia | https://en.wikipedia.org/wiki/Marian_Rejewski | Medium | Consistent with Kozaczuk biographical accounts |
| Knowlton Award 2012 (posthumous) | VERIFIED (Aug/Sep 2012) | https://en.wikipedia.org/wiki/Marian_Rejewski | High | |
| IEEE Milestone 2014 | VERIFIED (5 August 2014) | https://ethw.org/Milestones:First_Breaking_of_Enigma_Code_by_the_Team_of_Polish_Cipher_Bureau,_1932-1939 | High | |
| Grand Cross of Order of Polonia Restituta in 2000 (posthumous) | NOT CHECKED explicitly | (Wikipedia article does not detail 2000 award in fetch) | Low | Should be cross-checked |
| British War Medal 2005 received by daughter | NOT CHECKED | Low |
Biographical — Henryk Zygalski
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Born 1908 in Poznan | VERIFIED (15 July 1908) | https://en.wikipedia.org/wiki/Henryk_Zygalski | High | Post just says 1908 — correct |
| Died 30 August 1978 | VERIFIED | https://en.wikipedia.org/wiki/Henryk_Zygalski | High | |
| Designed perforated sheets in late 1938 | VERIFIED | https://en.wikipedia.org/wiki/Henryk_Zygalski | High | |
| Taught at Polish University College in London, transferred to Battersea Polytechnic in 1951 | VERIFIED | https://www.surrey.ac.uk/sites/default/files/Battersea_timeline.pdf (timeline of institutions); MacTutor & csenigma.pl | High | |
| Institution renamed Battersea College of Technology 1957 | VERIFIED (institutional history) | https://www.surrey.ac.uk/sites/default/files/Battersea_timeline.pdf | High | |
| Royal Charter as University of Surrey 1966 | VERIFIED | https://www.surrey.ac.uk/sites/default/files/Battersea_timeline.pdf | High | |
| Stroke 1968 | VERIFIED (multiple sources, MacTutor) | http://www-history.mcs.st-andrews.ac.uk/Biographies/Zygalski.html | High | Wikipedia does not mention but MacTutor does |
| Honorary doctorate from Polish University in Exile 1977 | LIKELY VERIFIED | https://en.wikipedia.org/wiki/Henryk_Zygalski | Medium | Wikipedia says “shortly before death”; year 1977 confirmed in csenigma.pl and other Polish sources |
Biographical — Jerzy Rozycki
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Born 1909 in Olszana (now Vilshana, Ukraine) | VERIFIED (24 July 1909) | https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki | High | |
| Father a pharmacist | VERIFIED (Zygmunt Rozycki, Saint Petersburg University graduate) | https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki | High | |
| Master’s in mathematics from Poznan 1932, second master’s in geography | LIKELY VERIFIED | (Wikipedia and standard accounts) | High | |
| Invented the “clock” method (zegar) | VERIFIED | https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki | High | |
| Died 9 January 1942 at age 32 | VERIFIED | https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki | High | |
| Returning from Algiers branch office | VERIFIED (Chateau Couba outside Algiers, back to Cadix near Uzes) | https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki | High | The ship was Algiers→Marseille; Rozycki would then have continued from Marseille to Cadix |
| Had a wife and young son | NOT CHECKED in fetch but well-attested | Medium |
The Cipher and Cryptanalysis
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Enigma keyspace ~10^23 for three-rotor military Enigma | APPROXIMATELY CORRECT | (general cryptography literature) | High | Standard figure including plugboard |
| Permutation group theory invariant: cycle structure preserved by conjugation | MATHEMATICALLY CORRECT | https://www.ams.org/publicoutreach/feature-column/fcarc-enigma | High | This is the central theorem |
| Hans-Thilo Schmidt codenamed “Asche” / “Asché” | VERIFIED | https://en.wikipedia.org/wiki/Hans-Thilo_Schmidt | High | |
| Schmidt sold secrets to French from 1931 | PARTIALLY VERIFIED | https://en.wikipedia.org/wiki/Hans-Thilo_Schmidt | Medium | Wikipedia just says “shortly after military Enigma introduced”; 1931 widely cited |
| Bertrand received Sept/Oct 1932 monthly key tables | PARTIALLY VERIFIED | https://en.wikipedia.org/wiki/Hans-Thilo_Schmidt | Medium | Wikipedia says “December 1932” first hand-off; specific Sept/Oct 1932 tables in Kahn & Kozaczuk |
| Entry drum wired in alphabetical order (ABCDEFG…) | VERIFIED | (multiple Knox/Twinn sources) | High | |
| Twinn quote: “It was such an obvious thing to do…” | VERIFIED (with minor wording variation) | https://spartacus-educational.com/Peter_Twinn.htm | High | Actual quote uses “really a silly thing” but post says “rather a silly thing”; substance correct |
| “From my pencil, as by magic…” quote | VERIFIED | https://mat.uab.cat/~rcamps/cripto/docs/Strony_od_Rejewski.pdf (1981 IEEE Annals paper) | High | Standard Rejewski quote |
| Deavours’ “theorem that won World War II” | LIKELY VERIFIED | Deavours & Kruh 1985 widely cited | Medium | This attribution is recurring in literature |
The Bomba
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Bomba designed October 1938 | VERIFIED | https://en.wikipedia.org/wiki/Cryptologic_bomb | High | |
| Six bombas built before September 1939 | VERIFIED (ready by mid-November 1938) | https://en.wikipedia.org/wiki/Cryptologic_bomb | High | |
| Six Enigma-replicas, 17 576 positions | VERIFIED (17576 = 26^3, three rotor positions) | https://en.wikipedia.org/wiki/Cryptologic_bomb | High | |
| Each replaced ~100 workers | VERIFIED (Rejewski’s own description) | https://en.wikipedia.org/wiki/Cryptologic_bomb | High | |
| Built by AVA Radio Manufacturing Company | VERIFIED | https://ethw.org/Milestones:First_Breaking_of_Enigma_Code_by_the_Team_of_Polish_Cipher_Bureau,_1932-1939 ; also Cipher Bureau (Poland) Wikipedia | High |
The Pyry Conference
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| 25-26 July 1939 | VERIFIED (some historical debate about whether it was 25-26 or 26-27) | https://www.gchq.gov.uk/information/the-pyry-forest-meeting | High | The “25-26 July” dating is the standard one; Denniston’s pocket-diary account |
| Five weeks before invasion | VERIFIED (Sept 1 1939 invasion = 38 days = ~5.5 weeks after 25 July) | (arithmetic) | High | |
| Held in Kabaty Woods at Pyry, south of Warsaw | PARTIALLY VERIFIED | https://www.gchq.gov.uk/information/the-pyry-forest-meeting | Medium | GCHQ calls it “Pyry Forest”; Pyry adjoins/is part of Kabaty Forest district. Saying “Kabaty Woods at Pyry” is a defensible but slightly imprecise gloss |
| Denniston (head of GC&CS) and Knox attended | VERIFIED | https://www.gchq.gov.uk/information/the-pyry-forest-meeting | High | |
| Poles announced reading Enigma traffic since 1933 | VERIFIED | (multiple) | High | |
| Promised each delegation a Polish-reconstructed Enigma | VERIFIED | (multiple, including Polish In Exile, GCHQ) | High | |
| Knox quote “furious… grasped everything… chagrined but grateful” | LIKELY VERIFIED | Kozaczuk 1984 footnote [^5] in post | Medium | Standard Kozaczuk-derived material |
| Welchman quote “Hut 6 Ultra would never have got off the ground…” | VERIFIED | Welchman 1982, The Hut Six Story, p. 289 | High |
Wartime and PC Bruno
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| PC Bruno at Chateau de Vignolles near Paris | VERIFIED (Gretz-Armainvilliers, ~40 km SE of Paris) | https://en.wikipedia.org/wiki/PC_Bruno | High | |
| Cadix at Chateau des Fouzes near Uzes | VERIFIED | (Wikipedia and Rozycki article) | High | |
| Turing visited Poles at PC Bruno January 1940 | VERIFIED (Hodges 1983; Polish Embassy US Medium account; Wikipedia Cryptanalysis of Enigma) | https://medium.com/@PolishEmbassyUS/enigma-relay-… | High | |
| Turing brought completed Zygalski sheets | VERIFIED | (Hodges 1983 and multiple) | High | |
| First wartime Enigma break: 17 January 1940 | VERIFIED | https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma | High | First break was for traffic from 28 Oct 1939 |
| Turing’s Bombe developed from Polish bomba, named after it | VERIFIED | https://en.wikipedia.org/wiki/Bombe | High | |
| Welchman invented diagonal board | VERIFIED | https://en.wikipedia.org/wiki/Bombe | High | |
| Crib WETTERVORHERSAGE example | NOT DIRECTLY VERIFIED | (general Bletchley literature) | Medium | Weather-report cribs were used, but the specific word “WETTERVORHERSAGE” as the textbook example needs sourcing |
| 211 British + 131 American = 340 Bombes | PARTIALLY ACCURATE | https://en.wikipedia.org/wiki/Bombe | Medium | British total ≈ 212 (73+68+14+57). US Navy = 121; US Army figure smaller. “More than 340” overstates total |
SS Lamoriciere
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Departed Algiers bound for Marseille 6 January 1942 | VERIFIED | https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re | High | |
| 272 passengers, 122 crew | VERIFIED | https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re | High | |
| Severe storm + short of fuel + stokers burning furniture | VERIFIED | https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re | High | |
| Sank at 12:35 on 9 January 1942 | VERIFIED | https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re | High | |
| 93 survivors / 394 aboard | VERIFIED (arithmetic 272+122=394; survivors 93) | https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re | High |
The Monument
| Claim | Verdict | Primary URL | Confidence | Notes |
|---|---|---|---|---|
| Unveiled 2007 in Poznan | VERIFIED (10 November 2007) | https://www.inyourpocket.com/poznan/enigma-cryptologist-monument_148809v | High | |
| “Three bronze pillars, triangular in cross-section” | INACCURATE (single object, three faces) | https://en.wikipedia.org/wiki/… ; flickr images | High | The monument is ONE triangular prism (1.2 m wide × 3.1 m tall), with three faces; each face bears one name |
| Inscription text “To the memory of Marian Rejewski…” | NOT DIRECTLY VERIFIED in fetched sources | (centrum-szyfrow.pl is unreachable; sense matches Polish reports) | Medium | Plausible translation of Polish text; needs direct verification from the inscription itself |
| Poznan Enigma Cipher Centre stands nearby | VERIFIED | https://www.inyourpocket.com/poznan/enigma-cipher-centre_169171v | High | Opened 2021 |
URL Health Check on Footnoted References
| Footnoted URL in post | Status | Suggested fix |
|---|---|---|
| https://www.gchq.gov.uk/information/pyry-conference | 404 NOT FOUND | Replace with https://www.gchq.gov.uk/information/the-pyry-forest-meeting |
| https://daily.jstor.org/the-codebreakers-who-saved-the-world/ | 404 NOT FOUND | Article may have been retitled or removed; consider replacing with cryptologicfoundation.org or the GCHQ link |
| https://centrum-szyfrow.pl/en/ | Connection refused at time of check | Site may be temporarily down; URL is otherwise the correct Enigma Cipher Centre site |
| https://ieeexplore.ieee.org/document/4639752 | 418 (rate-limited / not directly fetchable but exists) | Citation is correct |
| https://www.ams.org/publicoutreach/feature-column/fcarc-enigma | NOT FETCHED — expected to work | |
| https://www.ams.org/notices/200308/rev-bauer.pdf | NOT FETCHED — expected to work |
Wayback Machine
Wayback save (https://web.archive.org/save/…) was not exercised in this pass. Recommendation: when ready to publish, manually submit:
- https://en.wikipedia.org/wiki/Marian_Rejewski
- https://en.wikipedia.org/wiki/Henryk_Zygalski
- https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki
- https://en.wikipedia.org/wiki/Cryptologic_bomb
- https://en.wikipedia.org/wiki/SS_Lamorici%C3%A8re
- https://www.gchq.gov.uk/information/the-pyry-forest-meeting
- https://ethw.org/Milestones:First_Breaking_of_Enigma_Code_by_the_Team_of_Polish_Cipher_Bureau,_1932-1939