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Nov 8, 2017 at 22:19 comment added Wlodek Kuperberg @FedorPetrov Thanks, I stand corrected. Obviously, in a very tall isosceles triangle of base 1, the diameter of the inscribed circle is very close to 1, but the John ellipse's minor axis is just $\sqrt{3}/3$.
Nov 5, 2017 at 7:38 comment added Fedor Petrov @WlodekKuperberg Unit diameter, of course. I also used to think so. But John ellipdoid is not unique inclusion-maximal ellipsoid inside the ball.
Nov 5, 2017 at 2:06 comment added Wlodek Kuperberg @FedorPetrov: You probably mean a ball of unit diameter, not radius. But then: The body contains an ellipsoid whose every axis is of length at least 1 if and only if it contains a ball of diameter 1.
Nov 2, 2017 at 15:09 vote accept Turbo
Nov 2, 2017 at 15:09 vote accept Turbo
Nov 2, 2017 at 15:09
Nov 2, 2017 at 15:09 vote accept Turbo
Nov 2, 2017 at 15:09
Nov 2, 2017 at 14:57 vote accept Turbo
Nov 2, 2017 at 14:59
Nov 2, 2017 at 7:39 comment added Fedor Petrov Maybe, it is even true that the body does not contain a unit ball?
Nov 2, 2017 at 2:10 answer added Wlodek Kuperberg timeline score: 3
Oct 31, 2017 at 22:30 history edited Turbo CC BY-SA 3.0
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Oct 31, 2017 at 22:21 history asked Turbo CC BY-SA 3.0