Jakob MikschMar 4

for everyone who wants to refresh their knowledge about #Hausdorff distance and even wants learn about new developments, these blogposts by Martin Davis aka Dr. #JTS are great.

#gis #gischat #gistribe #geodata

https://lin-ear-th-inking.blogspot.com/2026/02/the-hausdorff-distance-challenge.html
https://lin-ear-th-inking.blogspot.com/2026/03/fast-hausdorff-distance-and.html

The Hausdorff Distance Challenge

The  Hausdorff Distance is a useful spatial function which can appear slightly mysterious. Partly this is due to the name.  It honours  Fel...

the roamerApr 6, 2025

So good to see liberal America standing up to the Trumpian threat today. A strange thing happened to me as I followed the topical posts.

Each time I saw the #HandsOff hashtag, what my brain read instead was #Hausdorff, for Felix Hausdorff, the eminent mathematician.

To my shame, I knew nothing about Felix Hausdorff the man. To me as a former Berliner and an emigree to England, Hausdorff sounded like an East Prussian landed-gentry name, I expected a Junker. Wrong. Today I learnt that Felix Hausdorff was in fact Jewish. He, his wife and his sister in law escaped the death camps by suicide, in 1942. (His daughter Lenore survived.) I never knew.

So there really is a hidden connection between today's encouraging #HandsOff news and Felix Hausdorff, the great thinker who was exposed to the same evil of unchecked state power that threatens us today, and against which today's protests took a stance.

https://en.m.wikipedia.org/wiki/Felix_Hausdorff

#HandsOff #Hausdorff #FelixHausdorff #Shoah #mathematicians

Felix Hausdorff - Wikipedia

tomsharpDec 16, 2024
In 1918, Felix Hausdorff proposed a measure of roughness of an object that Benoit Mandelbrot later called the object’s fractal dimension. #Poetry #Science #History #Mathematics #Hausdorff #Mandelbrot (https://sharpgiving.com/thebookofscience/items/p1918d.html)
1918,1974: Fractal dimension - The book of science

In 1918, Felix Hausdorff proposed a measure of roughness of an object that Benoit Mandelbrot later called the object’s fractal dimension.

Fabrizio MusacchioMay 11, 2023

The #Hausdorff Center for Mathematics #HSM in #Bonn is offering a course on „Formal Mathematics and Computer-Assisted Proving” (September 18 - 22, 2023) 🚀 There is also financial support for PhD and postdocs available 🙏 However, the deadline for the registration is already tomorrow (May 12, 2023) 💃🏻

🌍 https://www.hsm.uni-bonn.de/events/hsm-schools/formal2023/description/

Paolo CaressaJan 7, 2023
Felix Hausdorff defines a (#Hausdorff) #TopologicalSpace in his masterpiece "Mengenlehre" del 1914. #SetTheory #Topology
Show threadxameerAug 1, 2021
If X is a locally compact #Hausdorff space with no isolated points, there is an injective function (not necessarily continuous) from Cantor space to X, and so X has cardinality of at least , that of continuum
xameerApr 27, 2021
- functionally #Hausdorff space, is a topological space in which any two distinct points can be separated by a continuous function.
xameerApr 24, 2021
If S also is equipped with a metric or with topology that is #Hausdorff, st concept of a limit of a sequence is defined in S, then an infinite iteration on a countable sequence in S is defined exactly when the corresponding sequence of finite iterations converges.
xameerFeb 2, 2021
- every pseudo/metrizable is a sequential space and a #Fréchet–Urysohn space.
So convergence alone is enough to prove that it's open
A #Hausdorff topological vector space is sequential iff there exists no strictly finer topology with the same convergent sequences
xameerFeb 2, 2021
- a net in a space X can have more than one limit, but if X is a #Hausdorff space, the limit of a net, if it exists, is unique.