[請益] 又是命題邏輯
想請教高手
1.) Prove A v A v A |- B -> A
下面應該是屬於論述邏輯? (Predicate Logic)
2.) |- (for all x)(A -> B -> C) -> (for all x)(A -> B) -> (for all x)(A -> C)
3.) Prove by induction on terms, that for any terms t and s,
if s is a prefix of t, then the strings t and s must be identical.
我承認是問功課....
但我真的想不出來要怎麼證明?..... 第一題只有一邊有B 是要怎麼搞 Orz.....
題外話 學期快結束了 我還真好奇我怎麼存活到現在 囧..
感謝各位的幫忙 T_T
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The world ain't all sunshine n rainbows.It's a very mean n nasty place. N it'll
beat u to ur knees n keep u there permanently if u let it. You,me or nobody's
gon hit as hard as life. But it ain't about how hard u hit. It's about how hard
u can get hit;how hard u can take,n keep movin forward.If u know what u'r worth,
then go out n get what u'r worth. But u gotta be willing to take the hit, n not
pointing fingers saying u ain't where u r becuz of him, or her or anybody.
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