Very long article, and IMO it doesn't justify the "surprisingly deep" claim. Disappointing. Can I have my time back? tl;dr: a 'usage' of fractran is that fratc

Very long article, and IMO it doesn't justify the "surprisingly deep" claim. Disappointing. Can I have my time back? tl;dr: a 'usage' of fractran is that fratcran programs are collatz-like sequences, thus, the behaviour of collatz-like sequences is undecidable.