This looks like a bug. Can you open an issue for it? Aaron Meurer
On Mon, Oct 16, 2017 at 10:15 AM, <[email protected]> wrote: > The following code was run using sympy version 1.0, python version 3.4, > Anaconda installation. > > > import sympy as spy > import sympy.abc as abc > > > N, k = spy.symbols('N, k', positive = True) > es = 1 - (1 - 1/(2*N))**k > e = 2*N*es > spy.pprint(e) > c0 = spy.limit(e, N, spy.oo) > spy.pprint(c0) > c1 = spy.limit(N*(e-c0), N, spy.oo) > spy.pprint(c1) > c2 = spy.limit((e-c0-c1/N)*(N*N), N, spy.oo) > spy.pprint(c2) > c2x = spy.limit(e*N*N-c0*N*N-c1*N, N, spy.oo) > spy.pprint(c2x) > > > It prints > > > > ⎛ k ⎞ > ⎜ ⎛ 1 ⎞ ⎟ > 2⋅N⋅⎜- ⎜1 - ───⎟ + 1⎟ > ⎝ ⎝ 2⋅N⎠ ⎠ > k > 2 > k k > - ── + ─ > 4 4 > -∞ > 3 2 > k k k > ── - ── + ── > 24 8 12 > > > As you can see, the result for c2 is wrong, although it is able to calculate > c2x correctly. > > Can someone please clarify what is going on? > > Thanks! > > -- > 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 https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/8dd538f6-5487-4059-bd8c-eb1a86753af8%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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 https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6L_d_TteFmSPCdXUKsiCRv-LV6q%2BbAcMGR4R%3DmrWVY%2BLA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
