infix operators, type 1: .

 . :
    description:
        sp1 . sp2
        the infix operator for defining sequences of superpositions
        the infix dot represents the change from one superposition to the next
        the result is called a sequence

    examples:
        -- a couple of abstract examples:
        -- first a sequence of kets:
        |one> . |two> . |three> . |four> . |five>

        -- now a sequence of superpositions:
        |a> + |b> + |c> . |u> + |v> . |x> + |y> + |z>

        -- now using operators, to save a little typing:
        ssplit[" "] |one two three four>
            |one> . |two> . |three> . |four>

        split |abc> . split |uv> . split |xyz>
            |a> + |b> + |c> . |u> + |v> . |x> + |y> + |z>

    see also:
        ssplit, split, + , - , _ , __ , :_