Coding chains and arrays

With a collection of operators, we can build more elaborate operators. One method is chaining. For example, the operator product $\bold A = \bold B \bold C$is represented in the subroutine chain2( op1, op2, ...). Likewise the operator product $\bold A = \bold B \bold C \bold D$is represented in the in the subroutine chain3( op1, op2, op3,...). Another way to make more elaborate operators is to put operators in a matrix such as subroutine array also in module smallchain2. smallchain2operator chain and array