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New proofs of some theorems on infinitely differentiable functions: Corrigenda

Published online by Cambridge University Press:  17 April 2009

Michael A.B. Deakin
Affiliation:
Department of Mathematics, Monash University, Clayton, Victoria.
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In a recent note [1], Arkeryd presents a counterexample to my conjecture [2]. The same example appears in a preprint by von Grudzinski [3], who also points out that the corollary to Theorem 2 does not follow from the proof of the theorem as stated. The fact that x3 + xy3 and x3 + xy3y3 are right equivalent, but not under quasi-identity, provides a counterexample. The proof on p. 170 of [2] that is also incorrect. In order to establish this result, we note that, from equation (31), it suffices to show that ξ(0, t) = 0 for all t. But, from equation (30), f(ξ(0, t)) = 0. If now 0 is an isolated zero of f, we are done. If not, we may assume ξ(0, t) = 0 without loss of generality. The corollary to Theorem 4 shows that this latter case is, in fact, vacuous.

Type
Corrigendum
Copyright
Copyright © Australian Mathematical Society 1979

References

[1]Arkeryd, Leif, “A counter-example to a conjecture by Deakin”, Bull. Austral. Math. Soc. 18 (1978), 293294.Google Scholar
[2]Deakin, Michael A.B., “New proofs of some theorems on infinitely differentiable functions”, Bull. Austral. Math. Soc. 17 (1977), 161175.Google Scholar
[3]von Grudzinski, Olaf, “A note on right-equivalence of map-germs”, submitted.Google Scholar