Is there a reason why matrix(F,[[]]) and matrix(F,[]) should return 
different things?

sage: F=GF(3)
sage: a=matrix(F,[[]])
sage: b=matrix(F,[])
sage: a==b
False
sage: a.rows()
[()]
sage: b.rows()
[]
sage: a.block_sum(matrix(F,[[1,0],[0,1]]))

[0 0]
[1 0]
[0 1]
sage: b.block_sum(matrix(F,[[1,0],[0,1]]))

[1 0]
[0 1]

Thanks,

Jason


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