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)