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**

ket1 ** ket2
multiply the values of ket1 and ket2
we do our best to preserve categories
if one ket has a category, and the other doesn't then the result has that category
if ket1 and ket2 have different categories then return the empty ket |>
if ket1 and ket2 are 2D, then multiply them component-wise

|3> ** |5>
    |15>

|number: 3> ** |5>
    |number: 15>

|number: 3> ** |page: 5>
    |>

|2: 5> ** |3: 7>
    |6: 35>

arithmetic, ++ , -- , // , %% , ^^

infix type 2