Talk:Saddle-node bifurcation

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I wonder under what conditions the product n_s*n_u is negative (zero!!) given that the factors are the numbers of exponents of in left and right half open planes?

This is a shorthand to say that n_s \neq 0 and n_u \neq 0 (both are obviously non-negative numbers).

This is obvious but misleading "math" formality for no reason.

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