books.google.com - This unabridged republication of Fourier's Théorie Analytique de la Chaleur offers modern readers access to a landmark of modern science. With this work, the great mathematician first showed how any discontinuous function could be represented by a trigonometric series and advanced other concepts...https://books.google.com/books/about/The_Analytical_Theory_of_Heat.html?id=YARW_BgJvrwC&utm_source=gb-gplus-shareThe Analytical Theory of Heat
