User blog comment:Alemagno12/Ordinals in programming languages part 1: Brainfuck/@comment-1605058-20170319195359/@comment-50.161.94.113-20170323171556

Well, you need to be able to, or else w^2 and higher are impossible. You need decrements on w for transfinite looping [for example, w^2 is w[->w<])