èªç¶æ¼ç¹¹ï¼ããããããããè±: Natural deductionï¼ã¯ããèªç¶ãªããã®ã¨ãã¦ã®è«ççæ¨è«ã®å½¢å¼çã¢ãã«ãæä¾ãã証æçè«ã®ææ³ã§ãããå²å¦çè«çå¦ã®ç¨èªã§ããã èªç¶æ¼ç¹¹è«çã®ãããã¼ã¸ã§ã³ã«ã¯ãå ¬çãåå¨ããªããã¸ã§ã³ã»ã¬ã¢ã³ãéçºããä½ç³» L ã¯ã証æã®æ§æè¦åã«é¢ãã次ã®ãããª9ã¤ã®åºæ¬çè¦åã ããæã¤ã ä»®å®ã®è¦å "The Rule of Assumption" (A) ã¢ã¼ãã¹ããã³ã¹ "Modus Ponendo Ponens" (MPP) äºéå¦å®ã®è¦å "The Rule of Double Negation" (DN) æ¡ä»¶ä»ã証æã®è¦å "The Rule of Conditional Proof" (CP) â§-å°å ¥ã®è¦å "The Rule of â§-introduction" (â§I) â§-é¤å»ã®è¦å "The Rule of â§-elimina
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