Abstract
Let ϕ be a primitive substitution on a two-letter alphabet { a, b} having two fixed points ξ a and ξ b . We show that the substitution ϕ is invertible if and only if one has ξ a = abξ and ξ b = baξ. To cite this article: Z.-X. Wen et al., C. R. Acad. Sci. Paris, Ser. I 334 (2002) 727–731.
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