Deformation Retract - Neighborhood Deformation Retract

Neighborhood Deformation Retract

A pair of spaces in U is an NDR-pair if there exists a map such that and a homotopy such that for all, for all, and for all . The pair is said to be a representation of as an NDR-pair.

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Famous quotes containing the word neighborhood:

    “I was born and raised in a neighborhood called Noah’s Ark. If you didn’t travel in pairs, you just didn’t travel.”
    —Stanley Shapiro (1925–1990)