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Signature |
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signature, in music: see musical notation musical notation, symbols used to make a written record of musical sounds.
Two different systems of letters were used to write down the instrumental and the vocal music of ancient Greece. In his five textbooks on music theory Boethius (c.A.D. 470–A.D. ..... Click the link for more information. . signature (1) See digital signature.(2) A pattern used for matching. Also called a "fingerprint" or "definition." For example, antivirus companies maintain a database that contains the virus code (the signature) of each of the known viruses. To detect a virus, the antivirus program looks for these code strings in executable programs. Spyware blockers that look for spyware and adware also use signature patterns. An intrusion detection system also uses signatures, which are patterns that suggest an attack. For example, excessive logins that failed or the execution of certain programs. (3) A unique number built into hardware or software for identification. (4) A group of printed pages used in the construction of a book or booklet. Typically comprising 16 or 32 pages, signatures may also be 8, 12, 24, 48 or 64 pages long. The signature is printed on one large sheet of paper in a certain "imposition" order that, when cut and folded, results in the correct page sequence. The signatures are then bound together to make the final product. signature 1. Music See key signature time signature 2. US the part of a medical prescription that instructs a patient how frequently and in what amounts he should take a drug or agent signature [′sig·nə·chər] (electronics) The characteristic pattern of a target as displayed by detection and classification equipment. (graphic arts) A folded, printed sheet, usually consisting of 16 or 32 pages, that forms a section of a book or a pamphlet; the sheet may have fewer pages, but is always in multiples of four. (mathematics) For a quadratic or Hermitian form, the number of positive coefficients minus the number of negative coefficients when the form is reduced by a linear transformation to a sum of squares of absolute values. For a symmetric or Hermitian matrix, the number of positive entries minus the number of negative entries when the matrix is transformed to diagonal form. (naval architecture) The graphic record of the magnetic properties of a vessel automatically traced as the vessel passes over the sensitive element of a recording instrument; more accurately called magnetic signature. (ordnance) The identifying characteristics peculiar to each type of target which enable detecting apparatus, such as certain fuses, to sense and differentiate targets. (quantum mechanics) A quantum number α that characterizes a system with the symmetry of a prolate or oblate spheroid and satisfies the equationr = exp (-iπα), whereris the eigenvalue of the system under a rotation through 180° about an axis perpendicular to the symmetry axis.
Signature in mathematics, a number characterizing a quadratic form. Every quadratic form with real coefficients can be reduced by a nonsingular linear transformation of variables with real coefficients to the form
The difference ρ – q between the number of positive and negative terms in this expression is called the signature of the quadratic form. The numbers ρ and q are independent of the means by which the quadratic form is reduced to the form (*). Signature a number placed at the lower left-hand corner of the first page of each sheet of printed pages and repeated with an asterisk on the third page. The signature is used as a control in arranging the sections of a publication before binding. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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