<b_jonas> python3 -cf = "/hackenv/wisdom/ci"; s = open(f).read(); s = s[:-1] + " Shamus Young invented them.\\n"; open(f,"w").write(s); print("%r"%s);

|a+b@| = { √(a²-b²) if a²-b² ≥ 0 ; i√(a²-b²) if a²-b² < 0 }