Congratulations Erik! You found the field with one element in SageMath:
https://en.wikipedia.org/wiki/Field_with_one_element
I am really impressed.
Vincent
On 14/03/2018 16:49, Erik Bray wrote:
I am now pretty consistently getting the following failure on Cygwin
with 8.2beta8 (although strangely I've run the test once or twice with
success too...):
sage -t --warn-long 164.8 src/sage/structure/coerce_actions.pyx
**********************************************************************
File "src/sage/structure/coerce_actions.pyx", line 786, in
sage.structure.coerce_actions.IntegerMulAction._repr_name_
Failed example:
IntegerMulAction(ZZ, GF5)
Expected:
Left Integer Multiplication by Integer Ring on Finite Field of size 5
Got:
Left Integer Multiplication by Integer Ring on Finite Field of size 1
**********************************************************************
1 item had failures:
1 of 4 in sage.structure.coerce_actions.IntegerMulAction._repr_name_
[143 tests, 1 failure, 3.30 s]
----------------------------------------------------------------------
sage -t --warn-long 164.8 src/sage/structure/coerce_actions.pyx # 1
doctest failed
bizarre. Maybe some kind of cache bug?
On Wed, Mar 14, 2018 at 4:34 PM, Sébastien Labbé <sla...@gmail.com> wrote:
On Ubuntu 16.04, my first attempt at running make finishes with a problem
with giac (undefined reference to `png_set_longjmp_fn')
The log finishes with:
...
[giac-1.4.9.45.p2] libtool: link: g++ -g -O2 -fno-strict-aliasing
-DGIAC_GENERIC_CONSTANTS -Wl,-rpath -Wl,/home/slabbe/GitBox/sage/local/lib
-o .libs/icas icas.o -L/home/slabbe/GitBox/sage/local/lib ./.libs/libxcas.a
/home/slabbe/GitBox/sage/local/var/tmp/sage/build/giac-1.4.9.45.p2/src/src/.libs/libgiac.so
-lntl -lpari -lreadline -ltermcap -lgsl -lgslcblas -lrt -lpthread -lglpk
-ldl -lpng -lm -lmpfi /home/slabbe/GitBox/sage/local/lib/libmpfr.so -lgmp
-Wl,-rpath -Wl,/home/slabbe/GitBox/sage/local/lib
[giac-1.4.9.45.p2]
/home/slabbe/GitBox/sage/local/var/tmp/sage/build/giac-1.4.9.45.p2/src/src/.libs/libgiac.so:
undefined reference to `png_set_longjmp_fn'
[giac-1.4.9.45.p2] collect2: error: ld returned 1 exit status
[giac-1.4.9.45.p2] Makefile:579: recipe for target 'icas' failed
[giac-1.4.9.45.p2] make[5]: *** [icas] Error 1
[giac-1.4.9.45.p2] make[5]: Leaving directory
'/home/slabbe/GitBox/sage/local/var/tmp/sage/build/giac-1.4.9.45.p2/src/src'
[giac-1.4.9.45.p2] Makefile:404: recipe for target 'all-recursive' failed
[giac-1.4.9.45.p2] make[4]: *** [all-recursive] Error 1
[giac-1.4.9.45.p2] make[4]: Leaving directory
'/home/slabbe/GitBox/sage/local/var/tmp/sage/build/giac-1.4.9.45.p2/src'
[giac-1.4.9.45.p2] Makefile:333: recipe for target 'all' failed
[giac-1.4.9.45.p2] make[3]: *** [all] Error 2
[giac-1.4.9.45.p2] make[3]: Leaving directory
'/home/slabbe/GitBox/sage/local/var/tmp/sage/build/giac-1.4.9.45.p2/src'
[giac-1.4.9.45.p2]
********************************************************************************
[giac-1.4.9.45.p2] Error building giac-1.4.9.45.p2
[giac-1.4.9.45.p2]
********************************************************************************
...
I did
sage -f libpng && make
which seems to have fixed the error:
...
[giac-1.4.9.45.p2] successfully installed.
...
... still running.
Sébastien
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