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A proof of the homotopy push-out and pull-back lemma |
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| Authors: | Michihiro Sakai |
| Institution: | Graduate school of Mathematics, Kyushu University, Fukuoka, Japan, 812-8581 |
| Abstract: | The homotopy push-out and pull-back lemma of Iwase (1998) is a generalized version of Theorem 1.1 of Ganea (1965) and the Theorem of Rutter (1971) whose proofs were given under the simply-connectivity condition. The purpose of this paper is to give a proof in the general case. |
| Keywords: | Homotopy push-out homotopy pull-back NDR-pair |
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