Which of these mathematicians was born at an earlier date, Georg Cantor or Grigory Margulis?
Georg Cantor Georg Ferdinand Ludwig Philipp Cantor ( ; ] ; March 3 [O.S. February 19] 1845  – January 6, 1918) was a German mathematician. He invented set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers. In fact, Cantor's method of proof of this theorem implies the existence of an "infinity of infinities". He defined the cardinal and ordinal numbers and their arithmetic. Cantor's work is of great philosophical interest, a fact of which he was well aware.
Grigory Grabovoy Grigory Petrovich Grabovoy (Russian: Григо́рий Петро́вич Грабово́й ) (born November 14, 1963 in the region of Shymkent, Kazakhstan) is a Russian Doctor of Mathematics. Furthermore he claims to be a clear-sighted healer and the founder of the System of "Salvation and Harmonious Development" of all beings.