Is this a known problem? -- sage: sage.version.version '8.6' sage: assume(x,'real') sage: assumptions() [x is real] sage: e1=matrix([[0,-x],[x,0]]); e1 [ 0 -x] [ x 0] sage: e2=transpose(e1);e2 [ 0 x] [-x 0] sage: e1==e2 True sage: e1-e2 [ 0 -2*x] [ 2*x 0] sage: e1-e2==0 True -- sage: forget(x,'real') sage: e1=matrix([[0,-x],[x,0]]); e1 [ 0 -x] [ x 0] sage: e2=transpose(e1);e2 [ 0 x] [-x 0] sage: e1==e2 False sage: e1-e2 [ 0 -2*x] [ 2*x 0] sage: e1-e2==0 False -- sage: assume(x,'integer') sage: assumptions() [x is integer] sage: e1=matrix([[0,-x],[x,0]]); e1 [ 0 -x] [ x 0] sage: e2=transpose(e1);e2 [ 0 x] [-x 0] sage: e1==e2 True --
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