Chi̍p-ha̍p-lūn

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A sī B ê pō͘-hūn chi̍p-ha̍p (subset).

Chi̍p-ha̍p-lūn (set theory) sī leh gián-kiù chi̍p-ha̍p ê sò͘-ha̍k lí-lūn, ah chi̍p-ha̍p sī kā chi̍t-koá thiu-siōng ê mi̍h-kiāⁿ (object) khǹg taù-tīn ê 1 ê khài-liām. Chi̍p-ha̍p-lūn pau-hâm sió-ha̍k tō ū siāu-kài ê chit-koá koan-liām, chhiūⁿ chi̍t-koá mi̍h-kiāⁿ chiâⁿ-chò 1 ê chi̍p-ha̍p, chi̍p-ha̍p ê goân-sò͘, chi̍p-ha̍p ê sêng-oân (membership). Chi̍p-ha̍p-lūn, lô-chek, ham it-kai lô-chek (First-order logic) sī hiān-tāi sò͘-ha̍k ê ki-chân (foundations of mathematics), sò͘-ha̍k ê mi̍h-kiāⁿ ē-tit ēng bô tēng-gī ê "chi̍p-ha̍p" ham "chi̍p-ha̍p sêng-oân" lâi khí-chō.