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May 2, 2014 at 22:51 vote accept Jiarui Fei
Dec 22, 2011 at 3:11 comment added Chris Schommer-Pries ... or if your willing to go further and drink the derived cool-aid, you can just use the spectrum Hom(X,K) which is a module for the ring spectrum K=HZ and represents the total singular cohomology complex. Or even better, let K range over all spectra. Then you get all generalized cohomology theories this way!
Dec 22, 2011 at 0:04 history answered Steven Landsburg CC BY-SA 3.0