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Gilberto Francisco Loibel

Gilberto Francisco Loibel, Brazilian mathematician (São Paulo 24 May 1932 - São Paulo 13 November 2013)

Son of German immigrants


Authored Loibel theorem

Multiplications on products of spheres. An. Acad. Bras. Ciencias 31:161-2, 1959

Introduced the concept of finite relative determination

With P.F.S. Porto Jr. Relative finite determinacy and Relative Stability of Function Germs. Bol. Soc. Bras. Mat. 9(2), 1978.

With R.C.E. Pinto proved that c-equivalence lies strictly between d-equivalence and b-equivalence (1982)