By Pontrjagin L. S.

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34 N. 5 1) Suppose that : CU → CU is a contact Weyl diffeomorphism which induces the identity map on the base space. Then, there exists uniquely a Weyl function f # (ν 2 ) of the form f # = f 0 + ν 2 f +# (ν 2 ) ( f 0 ∈ R, f + (ν 2 ) ∈ C ∞ (U )[[ν 2 ]]), 1 (15) such that = ead ν { f0 +ν f+ (ν )} . 2) If induces the identity map on WU , then there exists a unique element c(ν 2 ) ∈ 1 2 R[[ν 2 ]] with c(ν 2 ) = c(ν 2 ), such that 5 = ead ν c(ν ) . 5, we have the following. 6 For any modiﬁed contact Weyl diffeomorphism : CU → CU which induces the identity map on the base space, there exists a Weyl function f # (ν 2 ) of the form f # (ν 2 ) = f 0 + ν 2 f +# (ν 2 ) ( f 0 ∈ R, f + (ν 2 ) ∈ C ∞ (U )[[ν 2 ]]), and smooth function g(ν 2 ) ∈ C ∞ (U )[[ν 2 ]] such that 1 = ead( ν {g(ν 2 )+ f # (ν 2 )}) (16) .

42]). However, it was already known in [31] that a Banach–Lie group acting effectively on a ﬁnite dimensional smooth manifold is necessarily ﬁnite dimensional. So there is no way to model the diffeomorphism group on a Banach space as a manifold. Under the situation above, at the end of the 1960s, Omori initiated the theory of inﬁnite-dimensional Lie groups, called “ILB-Lie groups”, beyond Banach–Lie groups, taking ILB-chains as model spaces in order to treat the diffeomorphism group on a manifold (see [32] for the precise deﬁnition).

For example, Etingof and Kazhdan proved every Poisson–Lie group can be quantized in the sense above, and investigated quantum groups as deformation quantization of Poisson–Lie groups. After their works, for a while, there were no speciﬁc developments for existence problems of deformation quantization on any Poisson manifold. The situation drastically changed when M. Kontsevich [10] proved his celebrated formality theorem. As a collorary, he showed that deformation quantization exists on any Poisson manifold.