Welcome

Thank you for visiting this site. This is the new portal for PineappleDesign.org.

For checking our activities please check at web.PineappleDesign.org. For reading Ichi Kanaya's book on quaternion mathematics please check at quaternion.PineappleDesign.org.

Blog of Ichi Kanaya is at blog.PineappleDesign.org. An alternative blog is available at leftsidestory.PineappleDesign.org.

Ichi Kanaya's Facebook page is at facebook.com/ichiroh.

新しいポータルサイトへようこそ．四元数に関する日本語の資料はこちらにあります．ブログはこちらとこちらです．Facebookはこちらです．