In this article, we formalize the differentiability of functions from the set of real numbers into a normed vector space [14].
@article{bwmeta1.element.doi-10_2478_v10037-011-0012-7, author = {Hiroyuki Okazaki and Noboru Endou and Keiko Narita and Yasunari Shidama}, title = {Differentiable Functions into Real Normed Spaces}, journal = {Formalized Mathematics}, volume = {19}, year = {2011}, pages = {69-72}, zbl = {1276.26035}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_v10037-011-0012-7} }
Hiroyuki Okazaki; Noboru Endou; Keiko Narita; Yasunari Shidama. Differentiable Functions into Real Normed Spaces. Formalized Mathematics, Tome 19 (2011) pp. 69-72. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_v10037-011-0012-7/
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