Antwort #66: Februar 25, 2009, 21:49:00
Ah, einen Winkel bestehend aus 2 Linien. Got it now. Thanks.
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Complete liberty of contradicting and disproving our opinion, is the very condition which justifies us in assuming its truth for purposes of action; and on no other terms can a being with human faculties have any rational assurance of being right. (John Stuart Mill - On Liberty)