#### Vol. 296, No. 2, 2018

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Corrections to the article The Johnson–Morita theory for the rings of Fricke characters of free groups

### Takao Satoh

Vol. 296 (2018), No. 2, 509–510
##### Abstract

There is a gap in the proof of Proposition 3.1, and it seems to be still an open problem to determine whether the map $\Phi$ is surjective or not. In order not to cause any effect on our main theorems, we modify our previous arguments in the following way.

##### Keywords
ring of Fricke characters, automorphism group of free groups, IA-automorphism group, Andreadakis–Johnson filtration, Johnson homomorphisms
Primary: 20F28
Secondary: 20J06