Möbius strip

The Möbius strip is a non-orientable differentiable manifold. Let $𝑋 = [0, 1] \times (0, 1)$ and let $(0, 𝑦) \sim (1, 1 - 𝑦)$ be an equivalence relation on $𝑋$ . Then $𝑀 = 𝑋 / \sim$ Möbius strip. #m/def/topology

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