* \isabellestyle{it} produces near math mode output;
* settings: smart setup of canonical ML_HOME, ISABELLE_INTERFACE, XSYMBOL_HOME;
recdef gcd "measure (%(m,n).n)"
simpset "simpset() addsimps [mod_less_divisor]"
"gcd (m, n) = (if n=0 then m else gcd(n, m mod n))"