Nyob rau xyoo 1885, Charles Sanders Peirce Charles Sanders Peirce Peirce txoj haujlwm tseem ceeb tshaj plaws hauv kev ua lej ntshiab yog nyob rau hauv cov laj thawj thiab lub hauv pausNws kuj tau ua haujlwm ntawm linear algebra, matrices, ntau yam geometries, topology thiab Sau cov naj npawb, Tswb tooj, daim duab, plaub xim teeb meem, thiab qhov xwm ntawm qhov txuas ntxiv. https://en.wikipedia.org › wiki › Charles_Sanders_Peirce
Charles Sanders Peirce - Wikipedia
thiab nws cov tub ntxhais kawm Oscar Howard Mitchell kuj tau tsim cov ntawv sau rau universal thiab existential quantifiers. Lawv sau Πx thiab Σx qhov peb tam sim no sau ∀x thiab ∃x. Pierce cov ntawv sau tau siv los ntawm ntau tus lej rau xyoo 1950.
Lub cim twg yog hu ua qhov muaj nuj nqis quantifier?
The symbol ∃ is called the existential quantifier.
Rau qhov twg muaj qhov muaj peev xwm siv tau?
Tus muaj nuj nqis quantifier, cim (∃-), qhia tias cov qauv hauv qab no tuav rau qee qhov (tsawg kawg ib qho) tus nqi ntawm qhov sib txawv ntawd.
Dab tsi yog qhov txawv ntawm cov khoom muaj nuj nqis thiab universal quantifier?
Lub quantifier universal, lub ntsiab lus "rau txhua tus", "rau txhua tus", "rau txhua tus", thiab lwm yam. Cov quantifier existential, lub ntsiab lus "rau qee tus", "muaj", "muaj ib", thiab lwm yam. Ib nqe lus ntawm daim ntawv: x, yog P(x) ces Q(x). Ib nqe lus ntawm daim ntawv: x li ntawd, yog P(x) ces Q(x).
Puas yog ib qho khoom muaj nqis?
Lub cim txhais tau tias "rau txhua tus", "muab ib qho", "rau txhua tus", lossis "rau txhua tus", thiab yog lub npe hu ua universal quantifier. Lub cim yog tus existential quantifier, thiab txhais tau tias ntau yam "rau qee tus", "muaj", "muaj ib", lossis "tsawg kawg ib qho ".
