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"The original curve forms a boundary of the tangent developable" — really? Is the parameter s assumed to be positive? The union of tangent lines, or tangent rays? Boris Tsirelson ( talk) 13:01, 10 June 2015 (UTC) reply

Hello. I can't add a link to the French article, called Développable des tangentes (conflict). Adam Bross ( talk) 21:49, 27 August 2022 (UTC) reply

Fixed. The problem was that the French article was linked to a redirect to this article preventing it from being linked directly. — David Eppstein ( talk) 21:56, 27 August 2022 (UTC) reply