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.
Johann Euler Johann Albrecht Euler (27 November 1734 – 17 September 1800) was a Swiss-Russian astronomer and mathematician. Also known as "Johann Albert Euler" or "John-Albert Euler", he was the first child born to the great Swiss mathematician Leonhard Euler (1707–1783), who had emigrated [for the first time] to Saint-Petersburg on 17 May 1727. His mother was Katharina Gsell (1707–1773) whose maternal grandmother was the famous scientific illustrator Maria Sibylla Merian (1647–1717) and whose father was the Swiss Baroque painter Georg Gsell (1673–1740) who had emigrated to Russia in 1716. Katharina married Leonhard Euler on 7 January 1734 and Johann Albert would be the eldest of their 13 children (only 5 of whom survived childhood).