reserve x,y for object;
reserve S for non void non empty ManySortedSign,
  o for OperSymbol of S,
  U0,U1, U2 for MSAlgebra over S;
reserve U0 for non-empty MSAlgebra over S;

theorem
  for S being non void non empty ManySortedSign, U0 being MSAlgebra over
  S holds MSAlgebra (#the Sorts of U0,the Charact of U0#) is MSSubAlgebra of U0
  by Lm1;
