Integrales De Lebesgue, Fonctions D'Ensemble, Classes De Baire

154 Pp. Publisher's Original Binding, Red Cloth Spine Lettered In Gilt, Marbled Boards. First Printing. From The Library Of Caltech Professor C. Hewitt Dix, With His Block Print Bookplate. Light Wear, Very Good. Per Wikipedia, Charles-Jean Étienne Gustave Nicolas, Baron De La Vallée Poussin (1866 – 1962) Was A Belgian Mathematician. He Is Best Known For Proving The Prime Number Theorem. In August 1914, De La Vallée Poussin Escaped From Leuven At The Time Of Its Destruction By The Invading German Army Of World War I, And He Was Invited To Teach At Harvard University In The United States. He Accepted This Invitation. In 1918, De La Vallée Poussin Returned To Europe To Accept Professorships In Paris At The Collège De France And At The Sorbonne. After The War Was Over, De La Vallée Poussin Returned To Belgium, The International Union Of Mathematicians Was Created, And He Was Invited To Become Its President. Between 1918 And 1925, De La Vallée Poussin Traveled Extensively, Lecturing In Geneva, Strasbourg, And Madrid. And Then In The United States Where He Gave Lectures At The Universities Of Chicago, California, Pennsylvania, And Brown University, Yale University, Princeton University, Columbia University, And The Rice Institute Of Houston. Although His First Mathematical Interests Were In Analysis, He Became Suddenly Famous As He Proved The Prime Number Theorem Independently Of His Coeval Jacques Hadamard In 1896. The Textbooks Of His Mathematical Analysis Course Have Been A Reference For A Long Time And Had Some International Influence. The Second Edition (1909-1912) Is Remarkable For Its Introduction Of The Lebesgue Integral. It Was In 1912, "The Only Textbook On Analysis Containing Both Lebesgue Integral And Its Application To Fourier Series, And A General Theory Of Approximation Of Functions By Polynomials". The Third Edition (1914) Introduced The Now Classical Definition Of Differentiability Due To Otto Stolz. The Second Volume Of This Third Edition Was Burnt In The Fire Of Louvain During The German Invasion. The Further Editions Were Much More Conservative, Returning Essentially To The First Edition.…