Jules Henri Poincaré

φ1 is obtained by substituting φ0 (s ) for φ(s ) in the right side of Eq. (3), and calling the result of this operation φ1 (t ). Thus φ1 (t ) = 12 t 0 f [s , φ0 (s )] ds . (5) ´ Charles-Emile Picard (1856 –1914), except for Henri Poincare, perhaps the most distinguished French math´ ematician of his generation, was appointed professor at the Sorbonne before the age of 30. He is known for important theorems in complex variables and algebraic geometry as well as…