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Hi, I don't know Wikipedia's conventions for references but someone could add: A. Gray, S. Salamon, E. Abbena: Modern Differential Geometry of Curves and Surfaces with Mathematica, p.402 as a reference — Preceding unsigned comment added by Deepfloe ( talkcontribs) 09:59, 9 December 2021 (UTC) reply

Peer-review request

Mathematicians, please help edit this page! Thank you. Stewart.M.Nash ( talk) 19:28, 25 October 2015 (UTC) reply

I'll submit a request for a peer review -- Mecanismo | Talk 17:54, 28 October 2015 (UTC) reply
This artilce is not formed plenty contents about third fundamental form. For example, there are not formed a history or reason.So i think you should edit more longer than from now about this category. -- jeje1991 | Talk 11:38, 1 November 2015 (UTC) reply