| 31. | This is just the statement that the preimage of an open set is open.
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| 32. | Are there even any non-trivial open sets in this space?
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| 33. | The null cone separates two open sets, for which and.
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| 34. | The basic open sets of the product topology are cylinder sets, here characterized as:
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| 35. | It's an " open set " and the public is welcome to watch the filming.
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| 36. | The complement of a sequentially open set is a sequentially closed set, and vice versa.
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| 37. | If the space is locally compact then every open set is measurable for this measure.
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| 38. | Diffeomorphic to some open set in, the Euclidean plane.
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| 39. | Suppose that is G�teaux differentiable at each point of the open set " U ".
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| 40. | To form a good cover for this surface, one needs at least four open sets.
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