NB. source - www.rlevine.ca
NB. English word "synonyms" ("equivalents") for some J primitives

NB. Arithmetic
Logof      =: ^.
Rootof     =: %:

Ceiling    =: >.  NB. Monad
Max        =: >.
Increm     =: >:

Floor      =: <.  NB. Monad
Min        =: <.
Decrem     =: <:

Lcm        =: *.  NB. extension of logical and
Gcd        =: +.  NB. extension of logical or
Base       =: #.
Antibase   =: #:
Complement =: -.


NB. Boolean
And  =: *.  NB. "logical multiplication"
Nand =: *:  
Or   =: +.  NB. "logical addition"
Nor  =: +:
Xor  =: ~:
Not  =: -.

NB. Catenation
Stitch   =: ,.   
Laminate =: ,:

NB. Error Trap
Adverse  =: ::

NB. "Execute" and Format
Do      =: ".
Format  =: ":

NB. Function modification
Fit     =: !.   
Obverse =: :.

NB. Miscellaneous
Less    =: -.

NB. Partition
Suffix  =: \.  
Outfix  =: \.  
Oblique =: /.
Key     =: /.  
Cut     =: ;.
Word    =: ;:

NB. Relational
Neq    =: ~:
Geq    =: >:  
Leq    =: <:
Match  =: -:

NB. Reshape
Ravelitems =: ,.
Itemize    =: ,:
Reverse    =: |.
Rotate     =: |.   NB. dyad
Transpose  =: |:

NB. Searching
Nub       =: ~.
Sieve     =: ~:

NB. Selection
Take      =: {.  NB. x Take y
Head      =: {.  NB.   Take y  (same as 1&Take y)

Drop      =: }.  NB. x Drop y
Behead    =: }.  NB.   Drop y  (same as 1&Drop y)

Tail      =: {:  NB. monad (same as _1&Take)
Curtail   =: }:  NB. monad (same as _1&Drop)

NB. Sorting
Gradeup   =: /:  NB. monad (Gradeup y)
Sortup    =: /:  NB. dyad  (x Sortup y)

NB. To sort array y in ascending order ... 
NB. use  dyadically       y Gradeup y   [or]  y Sortup y
NB. [or] reflexively      Gradeup ~ y   [or]    Sortup ~ y

Gradedown =: \:  NB. monad
Sortdown  =: \: