This function computes the Lie bracket between two vector fields.
i1 : X = random newField(2,1,"a")
o1 = - x ax + (- 4x + 3x + x )ax + (- 4x + x + 5x )ax
1 0 0 1 2 1 0 1 2 2
o1 : DiffAlgField
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i2 : Y = random newField(2,1,"b")
o2 = (4x + 7x + 3x )ax + (2x - 3x + 4x )ax + (6x - 2x )ax
0 1 2 0 0 1 2 1 0 1 2
o2 : DiffAlgField
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i3 : X | Y
o3 = (- 38x + 17x + 26x )ax + (32x + 17x )ax + (- 8x + 29x + 6x )ax
0 1 2 0 1 2 1 0 1 2 2
o3 : DiffAlgField
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