What nationality was Alexander Grothendieck?

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What nationality was Alexander Grothendieck?​

Alexander Grothendieck. Born in Germany, Grothendieck was raised and lived primarily in France. For much of his working life, however, he was, in effect, stateless. As he consistently spelled his first name “Alexander” rather than “Alexandre” and his surname, taken from his mother, was the Dutch-like Low German “Grothendieck”,…
What is Grothendieck’s work?
Grothendieck’s geometric work is documented in texts known as EGA (with Dieudonné ), an early account FGA, and the many volume account SGA of the seminars at l’IHÉS, Bures-sur-Yvette, where he was based at the time. (See the wikipedia article for some indication of the story from there until the early 1980s.)

What did Alexander Grothendieck contribute to geometry?​

Alexander Grothendieck ( /ˈɡroʊtəndiːk/; German: [ˈɡroːtn̩diːk]; French: [ɡʁɔtɛndik]; 28 March 1928 – 13 November 2014) was a mathematician who became the leading figure in the creation of modern algebraic geometry. His research extended the scope of the field and added elements of commutative algebra,…
Was johannja Grothendieck the right person for her children?
Johanna Grothendieck came from a Protestant family. Several stories and documents raise the question whether she was the right person to give guidance and love to her children. Growing up in Hamburg, she was an intelligent person with many possibilities. She did not feel happy in that bourgeois surroundings already at a young age.

Mathematician Barry Mazur, now at Harvard, recalls conversations with Grothendieck as having been “largely, perhaps only, about viewpoint, never about specifics. It was principally ‘the right vantage,’ a way of seeing mathematics, that he sought, and perhaps only on a lesser level its byproducts.”
Where did Wilhelm Grothendieck live during the war?
Grothendieck lived with his parents in Berlin until the end of 1933, when his father moved to Paris to evade Nazism, followed soon thereafter by his mother. They left Grothendieck in the care of Wilhelm Heydorn, a Lutheran pastor and teacher in Hamburg.

What is so special about Grothendieck’s work?​

Grothendieck attracted attention by an intense and highly productive activity of seminars there ( de facto working groups drafting into foundational work some of the ablest French and other mathematicians of the younger generation). Grothendieck himself practically ceased publication of papers through the conventional, learned journal route.
What happened to Sascha Grothendieck’s parents?
They left Grothendieck in the care of Wilhelm Heydorn, a Lutheran pastor and teacher in Hamburg. During this time, his parents took part in the Spanish Civil War, according to Winfried Scharlau, as non-combatant auxiliaries, though others state that Sascha fought in the anarchist militia.

Did Wilhelm Grothendieck ever marry Hanka?​

The marriage was dissolved in 1929 and Schapiro/Tanaroff acknowledged his paternity, but never married Hanka. Grothendieck lived with his parents in Berlin until the end of 1933, when his father moved to Paris to evade Nazism, followed soon thereafter by his mother.