Abstract
It is known ([4]) that under certain general conditions formal morphisms of differentiable spaces are differentiable. In this paper we show that these conditions are essentially necessary. Especially we establish the existence of formal, not differentiable morphisms of differentiable algebras. This solves a problem due to B. Malgrange ([1]).
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Literatur
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Reichard, K. Nichtdifferenzierbare Morphismen differenzierbarer Räume. Manuscripta Math 15, 243–250 (1975). https://doi.org/10.1007/BF01168676
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DOI: https://doi.org/10.1007/BF01168676