is-greater-than[value] ket returns yes/no if the value in ket > value
is-greater-than[5] |7> |yes> is-greater-than[3] |price: 3.50> |yes> is-greater-than[26] |number: 25> |no> -- if the ket has no float value then return the empty ket |> is-greater-than[13] |the cat> |>