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- W1878301423 abstract "A map d of the n -dimension E uclidean unit ball B n into itself is called universal if every map of B n into itself agrees with d at at least one point. Theorem. Let d be a map of B n into itself, let A= d 1 (S n-1 ) where S n-1 is the boundary of, B n and let f be the restriction of d to A. Then d is universal if and only if the homomorphism qenerated by f between the corresponding C e ch cohomology groups f* : H n-1 (S n-1 ) → H n-1 (A) is nontrivial." @default.
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- W1878301423 date "1975-05-01" @default.
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- W1878301423 title "A note on universal maps" @default.
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