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10.70 (1986)

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Find a geometrical justification for the Whitehead method for free products similar to the substantiation given for free groups by Whitehead himself and more visual than given in (D. J. Collins, H. Zieschang, Math. Z., 185, no. 4 (1984), 487–504; 186, no. 3 (1984), 335–361).

Contributor: H. Zieschang

Progress

D. J. Collins’ comment: there is a partial solution in (D. McCullough, A. Miller, Symmetric automorphisms of free products, Mem. Amer. Math. Soc. 582 (1996)).

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