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Wilder, R. L. Topology of manifolds, AMS Colloquium
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García-Maynez, A. and
Illanes, A. ‘A survey of multicoherence’, An. Inst. Autonoma Mexico 29 (1989) 17–67.
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is the union of two closed connected subsets, then their intersection is connected or empty.
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Wilson, W. A. (1930), "On the Phragmén–Brouwer theorem",
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