Presentations (Ex)

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Exercise 1: Let (f, b): M^{2n+1} \longrightarrow X be an n-connected (2n+1)-dimensional normal map, and let \left((e, a); (f, b), (f', b')\right): (W^{2n+2}; M^{2n+1}, M'^{2n+1}) \longrightarrow X \times (I; \{0\}, \{1\}) be a presentation. Such a presentation determines a (-1)^n-quadratic formation for (f, b) which is given by (H_{(-1)^n}(F); F, G).

What is the kernel formation for (f', b')?

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