This Equations That Changed the World Softcover Notebook is ready to be filled with your most creative proofs and calculations. Be inspired to tackle the hardest problem sets and maybe even find the answer to one of the great unsolved conjectures. These convenient A5 notebooks are equally at home on your lab bench and in the field. The uniquely textured cover feels soft under your fingers and the burnt orange elastic closure keeps all your musings safe. With alternating dotted lines and blank sketchbook pages, your problem sets and mathematical musings are sure to be more beautiful than ever. Dimensions A5: 5.8" x 8.3" (148 x 210 mm) Page Count 208 pages (104 sheets) Paper Type Blank & 7 mm dotted lines Paper Weight 81 gsm Binding Lay-flat softcover Paper Composition Acid-free100% recycled100% post-consumer waste Printing Soy-based ink Closure Elastic strap Notebook Feature Pages have colored edges Origin Designed in OregonPaper milled in JapanAssembled responsibly in China