sequence function: mbr

    description:
        mbr(ket, sp) returns the coeff of 'ket' in 'sp'.
        If 'ket' not in 'sp' then return |>
        
    examples:
        mbr(|b>, |a> + |b> + |c>)
            |b>
        
        mbr(|c>, 0.3|a> + 2|b> + 9.7|c> + 13|d>)
            9.7|c>
            
        mbr(|x>, 0.3|a> + 2|b> + 9.7|c> + 13|d>)
            |>

    see also:
        is-mbr, intersection

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