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Double | +: 0 0 0 | Not-Or

`+: y` is twice`y` .`` For example:
       +: 3 0 _2
    6 0 _4
|  | `x +: y` is the negation of`x` or `y` .`` For example,`0 +: 0` is`1` .

Since the square of the sum of two arguments equals the sum of their squares and twice their product, the following functions are equivalent:

       f=: + * +
       g=: *:@[ + +:@* + *:@]

For example:

       x=: 7 6 3 [ y=: 6 5 3
       x (f ; g ; (f=g) ; (f-:g)) y
    +----------+----------+-----+-+
    |169 121 36|169 121 36|1 1 1|1|
    +----------+----------+-----+-+

Since the domain of not-or is limited to zero and one, its entire behaviour can be seen in the following function tables:

       d=: 0 1                    Domain of nor
       d +:/ d                    Table of nor
    1 0
    0 0

       d +./ d                    Table of or
    0 1
    1 1

       -. d +./ d                 Negation of table of or
    1 0
    0 0

       (+:&.-./~d) ; (*:/~d)      Nand and nor are duals under not
    +---+---+
    |1 1|1 1|
    |1 0|1 0|
    +---+---+

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