The period since the CBHD Theorem first came to life, about 120 years ago, 3 can be divided into two distinct phases. The range 1890–1950, beginning 4 with Schur’s paper  and ending with Dynkin’s , and the remaining 5 60-year range, up to the present day. The first range comprises, besides 6 the contributions by the authors whose names are recalled in our acronym 7 CBHD, other significant papers (often left unmentioned) by Ernesto Pascal, 8 Jules Henri Poincaré, Friedrich Heinrich Schur.
KeywordsTransformation Group Formal Power Series Historical Overview Bernoulli Number Noncommutative Algebra
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