Quo Fuit places 6 dated presences for Paul Ehrenfest across 5 places, from 1880 to 1919.
Each one keeps the sentence it was taken from and a link to its source.
Paul Ehrenfest (18 January 1880 – 25 September 1933) was an Austrian theoretical physicist who made major contributions to statistical mechanics and its relation to quantum mechanics, including the theory of phase transition and the Ehrenfest theorem.Wikipedia, full article · CC BY-SA
Every dot is a place Paul Ehrenfest is documented in, on a dated record. The interactive globe carries the full detail.
Where Paul Ehrenfest was documented, and when
18 January 1880exact date
Viennaattested“Paul Ehrenfest was born on 18 January 1880 in Vienna to Jewish parents, who were originally from Loštice in Moravia (now part of the Czech Republic).”source: Wikipedia: Paul Ehrenfest
18 January 1880exact date
Lošticeattested“Paul Ehrenfest was born on 18 January 1880 in Vienna to Jewish parents, who were originally from Loštice in Moravia (now part of the Czech Republic).”source: Wikipedia: Paul Ehrenfest
18 January 1880exact date
Moraviaattested“Paul Ehrenfest was born on 18 January 1880 in Vienna to Jewish parents, who were originally from Loštice in Moravia (now part of the Czech Republic).”source: Wikipedia: Paul Ehrenfest
1901 to 1933period
University of Göttingenattested“At the time, it was customary in the German-speaking world to study at more than one university, and in 1901, Ehrenfest transferred to University of Göttingen, which until 1933 was an important site for mathematics and theoretical physics.”source: Wikipedia: Paul Ehrenfest
1903year
Leidenattested“In 1903, he met Dutch physicist Hendrik Lorentz during a short visit to Leiden, Netherlands.”source: Wikipedia: Paul Ehrenfest
1919year
Leidenattested“After Niels Bohr's first visit to Leiden in 1919, for Hans Kramers' thesis defense, he wrote to Ehrenfest: I am sitting and thinking of all what you have told me about so very many different things, and whatever I think of I feel that I…”source: Wikipedia: Paul Ehrenfest
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In each of these, a source puts Paul Ehrenfest and the place in the same dated sentence without stating
that Paul Ehrenfest was there. They are kept apart from the timeline above for exactly that reason:
a mention is not a presence, and Quo Fuit does not quietly promote one into the other.
23 June 1904exact date
Viennamentioned“on 23 June 1904 in Vienna, where he stayed from 1904 to 1905.”source: Wikipedia: Paul Ehrenfest
October 1912month
Leidenmentioned“In October 1912, Ehrenfest arrived in Leiden, and on 4 December, he gave his inaugural lecture, Zur Krise der Lichtaether-Hypothese (About the crisis of the light-ether hypothesis).”source: Wikipedia: Paul Ehrenfest
1923year
Berlinmentioned“In 1923 Einstein stayed there for six weeks, after German ultra-nationalists in Berlin had made threats against his life.”source: Wikipedia: Paul Ehrenfest
December 1925month
Leidenmentioned“On the occasion of the 50th anniversary of Lorentz' doctorate (December 1925) Ehrenfest invited both Bohr and Einstein over to Leiden, in an attempt to reconcile their scientific differences about the emerging quantum theory.”source: Wikipedia: Paul Ehrenfest
1928year
Leidenmentioned“His method is best illustrated by what he wrote to Robert Oppenheimer in the summer of 1928, after Oppenheimer invited himself for an extended stay in Leiden: If you intend to mount heavy mathematical artillery again during your coming y…”source: Wikipedia: Paul Ehrenfest
1928year
Hollandmentioned“His method is best illustrated by what he wrote to Robert Oppenheimer in the summer of 1928, after Oppenheimer invited himself for an extended stay in Leiden: If you intend to mount heavy mathematical artillery again during your coming y…”source: Wikipedia: Paul Ehrenfest
25 September 1933exact date
Amsterdammentioned“Having made arrangements for the care of his other children, on 25 September 1933, in Amsterdam, Ehrenfest fatally shot his younger son Wassik, who had Down syndrome, then killed himself.”source: Wikipedia: Paul Ehrenfest
Two people documented in the same place in the same year is a correlation, not a meeting.
Quo Fuit will never say they met without a source that says so.
How to read this page
Every line above is a dated fact taken from a source, with the sentence it came from and a link
back to it. Nothing is inferred, and a gap in the record is not evidence that someone was elsewhere.
A tag says how the fact is carried by its source: documented a structured,
explicitly dated record, attested a sentence that states the person was there,
mentioned a sentence that ties the person to the place without stating presence.
Sentences quoted from Wikipedia are available under CC BY-SA 4.0. Public domain books come from
Project Gutenberg. Quo Fuit claims no rights over these sources.
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