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no kurienes radies Pī[л] ?
kā izdomāja tieši šadu nosaukumu?
lūdzu pastāstiet visu par PĪ!
22, 2007, 20:26nezinīte
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Pī (π nevis л) ir skaitiskā attiecība starp riņka līnijas garumu un tās diametru: π = L/D (~3,14).

Kā simbols šajā izparatnē ir pazīstams kopš 1706. gada, kad to pirmo reizi lietoja Angļu rakstnieks Wiljams Džons.

Šīs attiecības vērtība jau meklēta un noteikta senatnē, piemēram, 3 (Vecajā derībā), 25/8 (Babilonā), 256/81 (Ēģiptē), 22/7 (Grieķijā), 355/113 (Ķīnā), √10 (Indijā).

Ar precizitāti līdz 16 zīmēm aiz komata, π vērtību aprēķināja Arābu matemātiķis Al-Kaši 1429. gadā. Lamberts 1767. gadā pierādīja, ka π ir iracionāls skaitlis, bet Lindemanis 1882. gadā –, ka transcendentāls skaitlis.

John Daintith, R.D. Nelson, 1989., The Penguin Dictionary of Mathematics
23, 2007, 11:59Zirneklītis
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