I am currently constructing pushdown automata.can I push/pop alphabet more than two in a transition??For example, $\delta$(a, a/aaa) means, in the state of input alphabet 'a' and stack point 'a' (there is only one item 'a') then it can push two more item 'a' on the stack so that there is three a's in the stack.
Simple question: Pushdown automata transition
pushdown automata