A set of basic textbooks for learning physics. - Title: Secret Calculus Physics - Title: Physics Input Lecture - Title: Physics Input Lecture Basic - Author: Hitoshi Aoyama - Publisher: Gakken - Publisher: Gakken My son purchased these, but he hardly used them, so I am selling them. There are signs of use in the mechanics section of the Input Lecture, with some initial pages read. There is a slight crease. A few pages are bent. The other three books show no signs of use. There were no writings or markings. Please forgive any oversight of markings, as this is a personal inspection. There are no noticeable stains, but please understand that these are used items and have been stored by a private individual before purchasing. Thank you for looking.