description:
subtraction-invert[t] ket
additive invert
return t - x
examples:
subtraction-invert[0] (0|x> + 3|y> - 0.5|z>)
0|x> - 3|y> + 0.5|z>
subtraction-invert[2] (0|x> + 3|y> - 0.5|z>)
2|x> - |y> + 2.5|z>
see also: