Multiplicities of Peano maps: on a less known theorem by Hurewicz
It is shown that the values of two highest multiplicities of Peano maps cannot be the values of openess.
This adds a new detail to the results by Hurewicz (1933), concerning dimension raising maps, when they are restricted to maps from the closed interval into the plane.
2. W. Sierpiński, Introduction to the theory of sets and topology (in Polish), Warszawa 1947 (second edition).
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