I am a teacher from Belarus. I admire the work in the GSP Chinese colleagues. Maybe someone interested in, and my job. It is made in Russian. However, mathematics teachers can understand.
Ian.
О, спасибо! Замечательно! Кривые постоянной ширины - интересная тема.
哦，谢谢你！太好了！固定宽度的曲线 - 一个有趣的话题。
Oh, thank you! Wonderful! The curves of constant width - an interesting topic.
