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11 December 2014

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3 March 2014

  • 21:1421:14, 3 March 2014 diff hist +45 Hurewicz theorem 132.199.33.191 talk The property "path-connected" is essential for the Hurewicz homomorphism to be the abelianization (cf. Hatcher: Algebraic Topology, §2.A, page 167). Regard (as a counterexample) a disjoint union of two 1-SPHERES. Then \pi_1=\Z and H_1=\Z\oplus\Z.

14 February 2014

12 February 2014

10 February 2014

20 November 2013

18 October 2013

25 June 2013

6 August 2012

1 August 2012

13 June 2012

11 June 2012