in your opinion?
He discovered the mechanism behind the greenhouse effect. And also that you can write functions as infinite series of trigonometric functions.Joseph Fourier, i dont know much about him but a few people mentioned him
what were his accomplishments?
Today a mathematician has the advantage of centuries of formal development of the field. Thus the quote "If I have seen further it is only by standing on the shoulders of giants" belies the question of who is the greatest mathematician or even the three best." The field of higher arithmetic alone is probably beyond the complete mastery of any two men, while geometry, algebra and analysis, especially the last are of even greater extent. "