Fig. 11. Ellipse with three foci: triangle, square and circle The oval in Figure 11 is the outline of a dish (a slightly skewed “blue-rimmed saucer”) with an avant-garde geometric pattern (with our unusual tricks), which could be 3D printed at the porcelain manufactory in Meissen. This production, we recall, was founded by Count Tschirnhaus, a researcher of three-focal ellipses [4]. A service made of such dishes would be very appropriate at a banquet on the occasion of the Fields or Abel Prizes, which are considered the most prestigious prizes in mathematics. They are often called the Nobel Prizes for this queen of sciences. There are many
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