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Lexikon


intuitionistic logic


ematics> Brouwer' s foundational theory of mathematics which says that you should not count a proof of (There exists x such that P(x)) valid unless the proof actually gives a method of constructing such an x. Similarly, a proof of (A or B) is valid only if it actually exhibits either a proof of A or a proof of B. In intuitionism, you cannot in general assert the statement (A or not-A) (the principle of the ef="module.php?name=Lexikon&file=search&eid=1&query=excluded middle">excluded middle) (A or not-A) is not proven unless you have a proof of A or a proof of not-A. If A happens to be ef="module.php?name=Lexikon&file=search&eid=1&query=undecidable">undecidable in your system (some things certainly will be), then there will be no proof of (A or not-A). This is pretty annoying some kinds of perfectly healthy-looking examples of ef="module.php?name=Lexikon&file=search&eid=1&query=proof by contradiction">proof by contradiction just stop working. Of course, excluded middle is a theorem of ef="module.php?name=Lexikon&file=search&eid=1&query=classical logic">classical logic (i.e. non-intuitionistic logic). {History (http://britanica.com/bcom/eb/article/3/0,5716,118173+14+109826,00.html)}. (2001-03-18)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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