עידן אריה
http://math-wiki.com/index.php?title=%D7%9E%D7%A9%D7%AA%D7%9E%D7%A9:%D7%A2%D7%99%D7%93%D7%9F_%D7%90%D7%A8%D7%99%D7%94
07:36
+117