@article{oai:iwate-u.repo.nii.ac.jp:00011355,
 author = {宮井, 秋男},
 journal = {岩手大学教育学部研究年報},
 month = {Feb},
 note = {More than 300 different proofs are known for the Pythagorean theorem. Inspired by E. Landau’s “unusual proof” for the theorem in trigonometric form, a proof based on the theory of power series is given. Also, a combinatorial equivalent with unexpected appearance is proposed for this most fundamental of all geometric theorems.},
 pages = {43--46},
 title = {The 300th-and-Something Proof of the Pythagorean Theorem　- A Combinatorial Equivalent - Dedicated to Professor H. Komiyama on the Occasion of His Retirement},
 volume = {68},
 year = {2009}
}