什么是語言a ^ mb ^ n的PDA(下推式自動機),其中n <m [英]What would be the PDA (pushdown automata) of the language a^mb^n where n<m
如何構造 L= { w ∈ {a, b}* | 的下推自動機對於某些 x ∈ {a, b}* },w 不等於 xx^R? [英]How to construct a pushdown automata for L= { w ∈ {a, b}* | w does not equal xx^R for some x ∈ {a, b}* }?