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Abstract. In the present paper, we obtain the following classification of closed orientable PL 5manifolds M 5 with free fundamental group of rank m, so that the di¤erence between the regular genus GðM 5 Þ and m is less or equal to eight: (a) GðM 5 Þ ¼ m i¤ M 5 G am ðS 1 Â S 4 Þ; (b) it is impossible m þ 1 a GðM 5 Þ a m þ 7; (c) if GðM 5 Þ ¼ m þ 8, then either M 5 G am ðS 1 Â S 4 ÞaðS 2 Â S 3 Þ or M 5 G am ðS 1 Â S 4 ÞaðS 2 Â S 3 Þ. @ As a consequence, we complete the classification of PL 5-manifolds up to regular genus eight, and compute the regular genus of the 5-dimensional real projective space RP 5 : if GðM 5 Þ ¼ 8; M 5 G S2 Â S3 @ GðS 2 Â S 3 Þ ¼ 8; then either M 5 G S2 Â S3 or or M 5 G a8 ðS 1 Â S 4 Þ; GðS 2 Â S 3 Þ b 8; @ GðRP
Forum Mathematicum – de Gruyter
Published: May 20, 2003
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