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One of my dogs likes tennis balls and the other likes sticks. I am getting them this educational toy so that they will learn about topology.

The dogs have submitted a proof that a cylinder and a sphere are topologically equivalent using the calculus of infinitesimals.

@futzle the critical topological feature of the sphere is lack of easy shapes to grab onto to tear apart, it seems

@futzle @s0 I concur and offer a supporting anecdote about some Koolies I once knew who could demolish a tennis ball in 30 seconds. Bird-dogs they were not.

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