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Aug 21, 2016 at 5:30 comment added Mark Grant You might be interested in Morse-Bott homology. As well as the original paper of Bott on periodicity, this is discussed in an article of Austin and Braam. I can dig out the precise references later if you like.
Aug 20, 2016 at 20:06 vote accept user94090
Aug 20, 2016 at 20:06 comment added user94090 Thank you for the answer, I see that this is not the right question. Anyway, I have in mind some examples, when the function has some number of components of the critical set and it seems stable by perturbations. So, I wondered what invariant would be responsible for that.
Aug 20, 2016 at 6:11 history edited Mark Grant CC BY-SA 3.0
Added easier example
Aug 20, 2016 at 5:53 history answered Mark Grant CC BY-SA 3.0