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math.GN1998
Exactly k-to-1 maps: from pathological functions with finitely many discontinuities to well-behaved covering maps
Jo Heath
Many mathematicians encounter k-to-1 maps only in the study of covering maps. But, of course, k-to-1 maps do not have to be open. This paper touches on covering maps, and simple ma…
math.GN1998
Locally 1-to-1 maps and 2-to-1 retractions
Jo Heath, Van C. Nall
This paper considers the question of which continua are 2-to-1 retracts of continua.