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Ben McKay
Ben McKay
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Not World War II, but World War I:

The 1st Edition of Abraham Fraenkel’s book Einleitung in die Mengenlehre (Introduction to Set Theory) went to press during World War I. Fraenkel had teachedbeen teaching set theory to his comrades while being at war, and this book werewas his lecture notes, so to say. He also gave his venia legendi lecture during the war, while being on furlough.

Not World War II, but World War I:

The 1st Edition of Abraham Fraenkel’s book Einleitung in die Mengenlehre (Introduction to Set Theory) went to press during World War I. Fraenkel had teached set theory to his comrades while being at war, and this book were his lecture notes, so to say. He also gave his venia legendi lecture during the war while being on furlough.

Not World War II, but World War I:

The 1st Edition of Abraham Fraenkel’s book Einleitung in die Mengenlehre (Introduction to Set Theory) went to press during World War I. Fraenkel had been teaching set theory to his comrades while at war, and this book was his lecture notes, so to say. He also gave his venia legendi lecture during the war, while on furlough.

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Wolfgang Jeltsch
Wolfgang Jeltsch
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Not World War II, but World War I:

The 1st Edition of Abraham Fraenkel’s book Einleitung in die Mengenlehre (Introduction to Set Theory) went to press during World War I. Fraenkel had teached set theory to his comrades while being at war, and this book were his lecture notes, so to say. He also gave his venia legendi lecture during the war while being on furlough.