1) The problem also appears in sagecell <https://sagecell.sagemath.org/>, which contradicts my constatation of having done this yesterday…
2) The problem is *not* in Maxima: ;;; Loading #P"/usr/local/sage-9/local/lib/ecl/sb-bsd-sockets.fas" ;;; Loading #P"/usr/local/sage-9/local/lib/ecl/sockets.fas" Maxima 5.44.0 http://maxima.sourceforge.net using Lisp ECL 20.4.24 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) display2d:false; (%o1) false (%i2) assume(k<0); (%o2) [k < 0] (%i3) Eq:diff(f(x),x,2)/f(x)=k; (%o3) 'diff(f(x),x,2)/f(x) = k (%i4) S:ode2(Eq,f(x),x); (%o4) f(x) = %i*%k1*sinh(sqrt(k)*x)+%k2*cosh(sqrt(k)*x) (%i5) subst([sqrt(k)=%i*sqrt(-k)],S); (%o5) f(x) = %k2*cos(sqrt(-k)*x)-%k1*sin(sqrt(-k)*x) HTH, Le jeudi 1 octobre 2020 à 16:59:58 UTC+2, Emmanuel Charpentier a écrit : > A new, interesting, and (IMHO) very serious bug : > > f=function("f") > var("k") > Eq=f(x).diff(x,2)/f(x)==k > with assuming(k>0):Sp=desolve(Eq,f(x),ivar=x) > with assuming(k==0):Sz=desolve(Eq,f(x),ivar=x) > with assuming(k<0):Sn=desolve(Eq,f(x),ivar=x) > var("_K1,_K2") > # with assuming(k<0): Sn1=Sn.subs(sqrt(k)==I*sqrt(abs(k))) # Crashes Sage > # with assuming(k<0): Sn2=Sn.subs(sqrt(k)==I*sqrt(-k)) # Crashes Sage also > # Maybe "with assuming..." fails ? > assume(k<0) > # Sn3=Sn.subs(sqrt(k)==I*sqrt(abs(k))) # Crash again > # Sn4=Sn.subs(sqrt(k)==I*sqrt(-k)) # Still crashes... > > Similar tricks *ejusdem farinae* worked up to 9.2.beta13… Did pynac > handling got modified ? > > What I get in a sage-shell-mode emacs session is in the attached > PynacCrash.txt (too long for the post body…). Advice on how to create an > informative ticket welcome... > .HTH, > > > Le jeudi 1 octobre 2020 15:57:03 UTC+2, Emmanuel Charpentier a écrit : >> >> ptestlong on a rebuilt 9.2.beta14+Trac#30675 >> <https://trac.sagemath.org/ticket/30675>results in one transient and >> five permanent failures, partially different from those obtained on the >> same machine with 9.2.beta13 : >> File Result P/T >> src/sage/schemes/hyperelliptic_curves/monsky_washnitzer.py Killed due to >> abort P >> src/sage/tests/parigp.py Timed out T >> src/sage/modules/fg_pid/fgp_module.py 3 doctests failed P >> src/doc/en/constructions/algebraic_geometry.rst 1 doctest failed P >> src/doc/en/developer/coding_in_other.rst 1 doctest failed P >> src/sage/modules/free_module_morphism.py 3 doctests failed P >> HTH, >> Le jeudi 1 octobre 2020 à 01:22:01 UTC+2, Volker Braun a écrit : >> >>> As always, you can get the latest beta version from the "develop" git >>> branch. Alternatively, the self-contained source tarball is at >>> http://www.sagemath.org/download-latest.html >>> >>> Again, if there is anything that should be merged in this beta cycle >>> then a positively-reviewed patch has to materialize real soon ;-) >>> >>> 1da6df404d (tag: 9.2.beta14) Updated SageMath version to 9.2.beta14 >>> be1a62b3bc Trac #30671: Random failure in src/sage/interfaces/psage.py >>> ed7c4a3ee0 Trac #30605: improve cone containment tests >>> ad0f8e0a1f Trac #30601: Move bitset.pxi to bitset_base.pxd >>> 89bf834ab3 Trac #30597: Define a sparse bitset structure >>> c539c2870a Trac #30663: tox.ini: Docker on Mac now needs $HOME too >>> 112d9daff1 Trac #30658: conda-forge-ubuntu-standard: Pillow fails to >>> install (follow up) >>> 0ef7e3ece8 Trac #30631: fix R on macOS xcode 12 >>> 6576814c37 Trac #30603: Upgrade readline to 8.0 >>> aa0a6d7b5f Trac #30546: python3 spkg-configure: Only search for >>> "python3", implement "configure --with-python=/PATH/TO/PYTHON" >>> 6969c604ad Trac #30664: Fixup for "Add quiet mode for bootstrap" >>> ebf4d9cf63 Trac #30662: Update conda package information, and fix >>> building Sage on conda >>> cbd8e5db72 Trac #29061: Upgrade to symmetrica-3.0.1 >>> 99ab61da02 Trac #30596: Outsource functions in bitset.pxi that can be >>> optimized by intrinsics >>> 97802f668d Trac #30595: Remove deprecated sage.libs.ppl >>> 9ed2f32d19 Trac #30585: Typo ticket: homogenous -> homogeneous >>> 9c205e9694 Trac #30577: remove test file for python3 syntax >>> 0b841a75e6 Trac #30575: add maple conversion for hypergeometric functions >>> de8e68e534 Trac #30572: Remove indirect typecasts when calling bitset.pxi >>> dbd108c10b Trac #30567: remove deprecated things in words >>> b4715d1b68 Trac #30563: Use configuration variable MAXIMA instead of >>> hardcoding "maxima" >>> 865f3ca815 Trac #30562: Gap downloads from wrong upstream directory >>> cd88566df0 Trac #30548: mention that sometimes it is wolfram, not math >>> for Mathematica script >>> 7169ec9867 Trac #30547: full flake8 for skew_tableau.py, as an experiment >>> 95712fc6ad Trac #30544: spkg-configure, system package info for tox >>> 2413f7b665 Trac #30523: polynomial_element.pyx: roots: SR: Fix if >>> determinant is not real >>> 28b594bb6e Trac #30486: Prepare doctests for Arb 2.18 >>> 43089d428d Trac #30337: Graphs: obtain distance-regular graphs from >>> generalised quadrangles >>> 82a9e2d091 Trac #29500: Install all Python packages via pip wheel (or >>> setup.py bdist_wheel), store wheels in $SAGE_LOCAL/var/lib/sage/wheels >>> 85906ba097 Trac #25119: Fail to integrate sqrt(x^2)/x >>> 5bf821488c Trac #15223: Let the `TestSuite` test that the construction >>> of a parent returns the parent >>> 501019f5b5 Trac #30610: Fix openblas to build with Xcode 12 >>> 19be84362c Trac #30576: Python 3.6: Fix locale/encoding issues in >>> docbuild, then re-enable Python 3.6 >>> af71febd64 Trac #30008: After #30053, sphinx 3.1.2 does not build on >>> ubuntu-{trusty,xenial,bionic}, debian-jessie, centos-7 (again) >>> 82534f5b92 Trac #30538: some flake8 cleanup in manifolds >>> 3d4a8d2e75 Trac #30533: Add quiet mode for bootstrap >>> 8700f751cf Trac #30532: sage.rings.ideal: Do not import >>> sage.interfaces.singular at load time >>> 0957fb642a Trac #30526: Irrelevant Example for _polynomial_list at >>> FP_template.pxi >>> 3d4760ce77 Trac #30522: polynomial_element.pyx: roots: SR: Return value >>> for vanishing determinant broken >>> 2fd8ef799e Trac #30516: Infinite WeightedIntegerVectors does not coerce >>> properly >>> e3de8ecdfb Trac #30515: implement string formatting for elements in RR >>> and CC >>> 6844bbe72a Trac #30514: fix pycodestyle E701/E702 in combinat >>> 6b4b28b893 Trac #30513: fix pycodestyle E401 >>> 7314b0db62 Trac #30510: Speed up method subgraph >>> 16b1089743 Trac #30509: Graphs: Faster implementation for HalfCube >>> 15cebad2f0 Trac #30503: src/tox.ini: Add environment codespell >>> 12c246ff72 Trac #30502: typo ticket 09/2020 >>> 8543b383c8 Trac #30497: more lgtm-suggested fixed >>> 55568686a8 Trac #30493: bug in border case in highest weight vectors of >>> tensor product of crystals >>> 12aa127d55 Trac #30492: Provide conversion methods to remove cythonizing >>> from doctests >>> 49f3450dab Trac #29975: Make numerical and probability doctests ready >>> for random seeds >>> 055c07e8c6 Trac #28394: comparison of sage rationals with gmpy2 mpq >>> broken >>> e1a7af2252 Trac #26060: Wrong limit(x / (x + 2^x + cos(x)), x=-oo) >>> cd50ac9ea4 Trac #5178: Make LLL_gram also work with Gram matrices with >>> non-integer entries >>> 69c51603dd Trac #30583: Upgrade: gmpy2 2.1.0.b5 >>> 6aa190cdee Trac #30531: Polyhedron_normaliz._triangulate_normaliz should >>> not use NmzResult directly >>> ff880f9919 Trac #29164: Computing log(0, 2) takes a long time >>> d55e6c9835 Trac #30604: fix scipy for XCode 12 >>> 468f23815a (tag: 9.2.beta13) Updated SageMath version to 9.2.beta13 >>> >>> -- You received this 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