What happens if we forget a trivial assumption ?
Arthur Charpentier · OpenEdition (OpenEdition) · 2014
Last week, @dmonniaux published an interesting post entitled l'erreur n'a rien d'original on his blog. He was asking the following question : let , and denote three real-valued coefficients, under which assumption on those three coefficients does has a real-valued root ? Everyone aswered , but no one mentioned that it is necessary to have a proper quadratic equation, first. For instance, if both and are null, there are no roots. It reminds me all my time series courses, when I define proce...