/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: GKRizvi https://cdn.slidesharecdn.com/profile-photo-GKRizvi-48x48.jpg?cb=1524124500 Pure mathematics is, in its way, the poetry of logical ideas. . . . . The observer, when he seems to himself to be observing a stone, is really, if physics is to be believed, observing the effects of the stone upon himself.