Jean Baptiste Joseph Fourier(1768-1830) 。had crazy idea (1807）:Any periodic function can be rewritten as a weighted sum of sines and cosines of different frequencies. 。Don't believe it? Neither did Lagrange, Laplace,Poisson and other big wigs Not translated into English until1878！ ·But it's true! called Fourier Series 六二
Jean Baptiste Joseph Fourier (1768-1830) • had crazy idea (1807): Any periodic function can be rewritten as a weighted sum of sines and cosines of different frequencies. • Don’t believe it? – Neither did Lagrange, Laplace, Poisson and other big wigs – Not translated into English until 1878! • But it’s true! – called Fourier Series
Example of Fourier Series:rectangular wave 3T 時間
• Example of Fourier Series: rectangular wave