- #1
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Hi, I am trying to show that ## \mathbb CP^4 ## and ## \mathbb CP^2 \times \mathbb CP^2 ## are not homeomorphic. None of the standard methods --comparing the fundamental group of the product with the product
of fundamental groups, nor (co)homology seem to work. So I am trying to work with the cup products and
show these are different. Please let me know if this is correct: we need to compute the cohomology groups on
each side, and then we just compute all possible cup products using Kunneth's formula. Is this correct?
Thanks.
of fundamental groups, nor (co)homology seem to work. So I am trying to work with the cup products and
show these are different. Please let me know if this is correct: we need to compute the cohomology groups on
each side, and then we just compute all possible cup products using Kunneth's formula. Is this correct?
Thanks.