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# 4C. Test

`d0=: -:&(/:~)` | Are x and y permutations of each other?
`m1=: /:~-:i.@#` | Is y a permutation vector?
`m2=: -:-@|:` | Is y antisymmetric?
`m3=: -:|:` | Is y symmetric?
`m4=: [:+./[:*./]=/0 1"_` | Are all atoms of Boolean list y equal?
`m5=: *./ .= +./` | Are all atoms of Boolean list y equal?
`m6=: *./ .= *./` | Are all atoms of Boolean list y equal?
`d7=: -.@(] <:/ .>: >.@] , [)"1` | Is y in the half open on the right interval x and is it an integer?
`d8=: e.` | Is list x a row of array y?
`m9=: *./@(= >./\)` | Are columns of y in ascending order?
`m10=: *./@(= <./\)` | Are columns of y in descending order?
`m11=: >./=<./` | Are atoms of numerical list y equal?
`m12=: *./ +. -.@(+./)` | Are atoms of Boolean list y equal?
`m13=: *./ = +./` | Are atoms of Boolean list y equal?
`m14=: *./@(= {.)` | Are atoms of list y equal?
`m15=: 0:=#|+/` | Are atoms of Boolean list y equal?
`m16=: *./@(#1&|.)` | Are atoms of Boolean list y equal?
`m17=: ([:,:0:,#)-: v19"_ rxmatch ]` | Is y a legal J name?
`d18=: rxmatch=: 17!:0` | '' to get rxmatch
`v19=: '[[:alpha:]][[:alnum:]_]* '"_` | 'regex' to get alpha: and alnum:

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