Tacit APL Crossword

123456
Across
  1. 1. Derived fixed point function of f
  2. 2. Is ⍺ a superset of ⍵?
  3. 3. ⍺th root of ⍵
  4. 6. Convert ⍵ from Fahrenheit to Celsius
Down
  1. 1. Reverse hook, (g Y) f Y
  2. 4. Multiplication table up to ⍵
  3. 5. Number of permutations of ⍺ out of ⍵