Talk:Otto Stolz

differentiable?
The condition f((x+y)/2)<(f(x)+f(y))/2 is just a convexity condition. For example, the absolute value function on [-1,1] satisfies it, without being differentiable, contrary to the claim in the article. Tkuvho (talk) 04:35, 7 September 2010 (UTC)
 * Should be "has left and right derivatives." Xanthoxyl  &lt; 20:29, 7 September 2010 (UTC)

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L'Hôpital's Rule counterexample
I think it is notable that Otto Stolz may have been the first to publish a counter-example to L'Hôpital's rule (see wiki and a paper on it). Balta katei  21:52, 11 September 2019 (UTC)