Triangular numbers: Difference between revisions

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 '''Also works with gojq and fq, the Go implementations of jq'''
-In the following, `$r | figurates` generates
+The main point of interest in the following is probably `figurates/0`, which generates
-an indefinitely long stream of the $r-simplex numbers if $r >= 2.
+an indefinitely long stream of the $r-simplex numbers if $r >= 2, where $r is the input to the filter.
+For the sake of illustration, however, `tetrahedrals` and `pentatopics` are defined without reference to `figurates/0`.
 '''Preliminaries'''
@@ Line 694: / Line 695: @@
 def tetrahedralRoot:
-  def cubrt: pow(.; 1/3);
   def term(sign):
      (3 * .) as $y
-     | ($y + sign * ( (($y*$y) - (1/27))|sqrt)) | cubrt;
+     | ($y + sign * ( (($y*$y) - (1/27))|sqrt)) | cbrt;
   term(1) + term(-1) -1;