Unsolved Mathematics Problems - a collection of unsolved mathematics problems. The acoustics, mathematics and temperament of pianos is discussed or why a piano can not be tuned perfectly are discussed here with references. The on-line Encyclopedia of Physics. When paper is folded, an origami geometry is at work. Tom Hull provides information on investigations into the mathematics of origami as carried out by mathematicians, scientists, and artists.
Modular origami is a branch of the art of paperfolding.
Unlike regular origami, where a figure or sculpture such as a crane, frog, or airplane is made from a single sheet of paper without glue or cutting, modular origami figures are built up from multiple individually folded pieces, usually identical. Modular origami is often very geometric. Edwin Corrie are also provided. Of the 85 tie knots found, the model predicts the four knots in widespread use and introduces nine new ones. The Third International Mathematics and Science Study represents the most extensive investigation of mathematics and science education ever conducted.