"Nā kiam ta nā" pán-pún chi-kan bô-kāng--ê tē-hng

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無編輯摘要
無編輯摘要
Tē 1 chōa:
'''Nā chhiá ta nā''' ([[Eng-gí]]: ''if and only if''; '''iff''') sī chi̍t khoán [[lô-chek]] tiâu-kiāⁿ, khah chheng-chhó lâi kóng chiō sī '''nā-sī jî-chhiá ka-ta nā-sī''', sī piau-chún bu̍t-chit tiâu-kiāⁿ (''material conditional'') "ta nā" (téng-î "nā ... chiō") kap i-ê tó-hoán "nā" cho͘-ha̍p--khí-lâi tùi nn̄g hāng tîn-su̍t ê [[siang-tiâu-kiāⁿ lô-chek|siang-tiâu-kiāⁿ]] [[lô-chek liân-chiap]] (''biconditional logical connective'') koan-hē.
 
Pún tiâu-kiāⁿ kong-tēng ê ì-sù sī piáu-sī i só͘ liân-chiap ê siang-pêng tîn-su̍t, nā m̄-sī siâng-pêng lóng sī [[chin (lô-chek)|chin]]--ê, chiō sī siâng pêng lóng sī [[ké (lô-chek)|ké]]--ê.
 
Chit-ê tiâu-kiāⁿ kap [[pì-iàu kiam chhiong-chiok]] tiâu-kiāⁿ sī siô-siâng ê ì-sù. Nā kóng ''P nā chhiá ta nā Q'', ì-sù kap ''Q tùi P pì-iàu kiam chhiong-chiok'' sī sio-kâng--ê; mā kap ''P sī kap Q téng-tat'' (''equivalent'') kâng ì-bī.
 
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