"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 chhiáchhiáⁿ ta nā''' ([[Eng-gí]]: ''if and only if''; '''iff''') sī chi̍t khoán [[lô-chek]] tiâu-kiāⁿ, khah chheng-chhó lâi kóng tiō sī '''nā-sī kiam ta-ū nā-sī''', sī piau-chún bu̍t-chit tiâu-kiāⁿ (''material conditional'') "ta nā" (tùi-tâng "nā ... tiō") 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)|chiàⁿ-si̍t]]--ê, tiō sī siâng pêng lóng sī [[chhò (lô-chek)|m̄-tio̍h]]--ê; he̍k-chiá kóng kî-tiong chi̍t hāng tîn-su̍t ê chiàⁿ-si̍t, sī ài óa-khò lēng-gōa chi̍t hāng ê chiàⁿ-si̍t.