/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: lawlietg https://cdn.slidesharecdn.com/profile-photo-lawlietg-48x48.jpg?cb=1523411957 As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality. - Albert Einstein