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There is a theorem of Dold to this effect---around 1965:
Dold, I thinkAlbrecht Die Homotopieerweiterungseigenschaft (=HEP) ist eine lokale Eigenschaft. (German) Invent. Math. 6 1968 185–189.
There is a theorem of Dold to this effect---around 1965, I think.
There is a theorem of Dold to this effect:
Dold, Albrecht Die Homotopieerweiterungseigenschaft (=HEP) ist eine lokale Eigenschaft. (German) Invent. Math. 6 1968 185–189.
