Mathematics
- Exotic R4, a differentiable manifold, homeomorphic but not diffeomorphic to the Euclidean space R4
- Exotic sphere, a differentiable manifold, homeomorphic but not diffeomorphic to the ordinary sphere
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“It is a monstrous thing to force a child to learn Latin or Greek or mathematics on the ground that they are an indispensable gymnastic for the mental powers. It would be monstrous even if it were true.”
—George Bernard Shaw (1856–1950)
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