*** WARNING: Code contains non-ascii characters ***
Error in lines 1-1
Traceback (most recent call last):
File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1013, in execute
exec compile(block+'\n', '', 'single') in namespace, locals
File "", line 1, in <module>
File "sage/matrix/matrix2.pyx", line 8722, in sage.matrix.matrix2.Matrix.inverse (/ext/sage/sage-8.0/src/build/cythonized/sage/matrix/matrix2.c:69765)
return ~self
File "sage/matrix/matrix_integer_dense.pyx", line 3982, in sage.matrix.matrix_integer_dense.Matrix_integer_dense.__invert__ (/ext/sage/sage-8.0/src/build/cythonized/sage/matrix/matrix_integer_dense.c:33599)
A,d = self._invert_flint()
File "sage/matrix/matrix_integer_dense.pyx", line 3943, in sage.matrix.matrix_integer_dense.Matrix_integer_dense._invert_flint (/ext/sage/sage-8.0/src/build/cythonized/sage/matrix/matrix_integer_dense.c:33436)
raise ZeroDivisionError('Matrix is singular')
ZeroDivisionError: Matrix is singular
x