What is wrong with the following calculation? 0 = 0 + 0 + 0 + = (1 - 1) + (1 - 1) + (1 - 1) + .. = 1-1 +1 -1 + 1 - 1 + ... = 1 + (-1 + 1) + (-1 + 1) + (-1 + 1) + ... = 1 + 0 + 0 + 0 + ... = 1 (Guido Ubaldus thought that this proved the existence of God because something has been created out of nothing.")