Assignment: cell(ptr x 1) = cell(ptr) Using: cell(ptr); cell(ptr x 1); cell(ptr x 2) [ >+>+<<- ] >> [ << + >> - ] << Addition: cell(ptr) = cell(ptr) x cell(ptr x 1) Using: cell(ptr); cell(ptr x 1) > [ <+>- ] < Subtraction: cell(ptr) = cell(ptr) _ cell(ptr x 1) Using: cell(ptr); cell(ptr x 1) > [ <->- ] <