Before revision: The instruction set of five commands is small but Turing complete and therefore enough to represent all mathematical functions: incrementing ("inc ")or decrementing ("dec") a register , unconditional jump ("jmp") , conditional jump ("isz", skips next instruction if a register is zero), and stopping program execution ("stp").
After revision: The instruction set of five commands is small but Turing complete and therefore enough to represent all mathematical functions: