Hi GFR

Thanks . And thanks for corrections as well. Sometimes I am too lazy just too learn the basics to the last detail...

But finally I understood what is Ackermann function as well, in Your clear and simple bracket notation. Quite impressive function.Very fast. And its Inverse seems to be very slow.

But now suddenly I am interested in i[i]i = Ack[i]. What shall I do

Ivars

Thanks . And thanks for corrections as well. Sometimes I am too lazy just too learn the basics to the last detail...

But finally I understood what is Ackermann function as well, in Your clear and simple bracket notation. Quite impressive function.Very fast. And its Inverse seems to be very slow.

But now suddenly I am interested in i[i]i = Ack[i]. What shall I do

Ivars