By George Salmon

Quantity: 2 writer: London Longmans, eco-friendly topics: Geometry, Analytic -- reliable Surfaces Notes: this is often an OCR reprint. there is typos or lacking textual content. There aren't any illustrations or indexes. in case you purchase the overall Books variation of this booklet you get unfastened trial entry to Million-Books.com the place you could make a choice from greater than one million books at no cost. it's also possible to preview the ebook there.

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**Additional resources for A treatise on the analytic geometry of three dimensions**

**Example text**

14. (Derivations, consequence) A derivation of the wff A from the set of wff’s Γ is a finite sequence of wff’s, in which each formula satisfies (at least) one of (1)–(3). (1) The wff is a theorem; (2) the wff is an element of Γ ; (3) the wff is obtained from preceding elements of the sequence by an application of the rule (MP). The wff A is a logical consequence of the set of wff’s Γ , which is denoted by Γ A , when there is a derivation of A from Γ . Notice that although both proofs and derivations are finite sequences of wff’s, the premise set Γ itself does not need to be finite.

Classical first-order logic 27 The other rule of K is (UG). We have to justify the following step in a proof. . A( x) ? , namely, ( ∀) . However, this rule has a side condition, which requires that there are no free occurrences of y anywhere in the lower sequent, which means that the formula ∀ x A( x) may not contain such occurrences of y . This may be guaranteed by requiring that all the free occurrences of y are selected—provided that x is OK for all those occurrences. However, x is always OK for x in any A , and the ( ∀) rule does not require—though it permits—changing the y in A( y) (in the upper sequent) to x in ∀ x A( x) .

LK is intended to be a calculus that allows not simply proofs and derivations, but also reasoning about logical inferences. Sequents in LK have a natural informal interpretation: A1 , . . , An B1 , . . , Bm is to be thought of as the inference from all the premises A1 , . . , An to some of the conclusions B1 , . . , Bm . Using the language of LK , we can rephrase this as A1 ∧ . . ∧ An implies B1 ∨ . . ∨ Bm . ) This way of looking at sequences imparts a new interpretation of the rules. Let us start with the three pairs of structural rules.

### A treatise on the analytic geometry of three dimensions by George Salmon

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