I have not personally encountered such results but this paper[1] by William Kahan should give you good number of examples. I encountered it while trying to implement symbolic interval arithmetic in SymPy.
[1]: [How Futile are Mindless Assessments of Roundoff in Floating-Point Computation?](http://www.cs.berkeley.edu/~wkahan/Mindless.pdf) On 29 October 2014 16:08, Christophe Bal <[email protected]> wrote: > Hello. > > I'm writing a french book about SageMathCloud and I'm looking for known > wrong results given by Sage or Sympy due to floats calculations, or due to > the formal method used. Do you know such things ? My idea is to show to new > user that a CAS or a numerical tool is not Math God. > > I've already posted this question on the Sage list without a lot of success. > > Christophe BAL > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAAb4jGkfLT8oK_-v9KGbgw6q18oPOOauaG%3DAV7dNRNKL0hOQ1Q%40mail.gmail.com. > For more options, visit https://groups.google.com/d/optout. -- Harsh -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADN8iupyTH-4Z11DFnZ53sLurj4NjHhkmjrFUcBicSc7EaNB7w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
