On: How not to teach recursion (2021)

[Someone]

A simpler way multiplication is recursive is the way it is defined for natural numbers in mathematics:

  a × b = 0                if b = 0
  a × b = a + a × (b - 1)  if b ≠ 0

[nonsapreiche → Someone]

a x b = a if b = 1

[ethanwillis → nonsapreiche]

What is a + a x 0? :)