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Что (кто) такое keyed original trace - определение
TRADITIONAL SWEDISH MUSICAL INSTRUMENT
Nyckelharp; Nordic keyed fiddle; Swedish keyed fiddle; Nykleharpa; Key harp; Key fiddle; Keyed Harp; Key Harpa; Keyed fiddle
.jpg?width=200 "Traditional method of playing")
![Angel with ''viola a chiavi'' ('keys'), Cappellina di [[Palazzo Pubblico]], [[Siena]], [[Italy]]. Fresco by [[Taddeo di Bartolo]], 1408.](https://commons.wikimedia.org/wiki/Special:FilePath/Viola a chiavi Siena 1408.jpg?width=200 "Angel with ''viola a chiavi'' ('keys'), Cappellina di [[Palazzo Pubblico]], [[Siena]], [[Italy]]. Fresco by [[Taddeo di Bartolo]], 1408.")
![Two angels with nyckelharpa, fresco in the church at Tolfa, [[Tierp Municipality]], [[Uppland]], [[Sweden]]. Unknown painter, 1503.](https://commons.wikimedia.org/wiki/Special:FilePath/Sweden tolfta church angels with nyckelharpa.jpg?width=200 "Two angels with nyckelharpa, fresco in the church at Tolfa, [[Tierp Municipality]], [[Uppland]], [[Sweden]]. Unknown painter, 1503.")
![Schlüsselfidel (lower right) shown in [[Michael Praetorius]]' ''Syntagma Musicum'', 1619.](https://commons.wikimedia.org/wiki/Special:FilePath/Strohfiddel.jpg?width=200 "Schlüsselfidel (lower right) shown in [[Michael Praetorius]]' ''Syntagma Musicum'', 1619.")
![[[Marco Ambrosini]] at [[Burg Fürsteneck]], Germany, playing a nyckelharpa built by Annette Osann.](https://commons.wikimedia.org/wiki/Special:FilePath/Marco Ambrosini mit der Nyckelharpa.jpg?width=200 "[[Marco Ambrosini]] at [[Burg Fürsteneck]], Germany, playing a nyckelharpa built by Annette Osann.")
![[[Didier François]] teaching his special technique at the International Days of the Nyckelharpa at Burg Fürsteneck, 2005.](https://commons.wikimedia.org/wiki/Special:FilePath/Didier François teaching his special nyckelharpa-technique.jpg?width=200 "[[Didier François]] teaching his special technique at the International Days of the Nyckelharpa at Burg Fürsteneck, 2005.")
![Mia Gundberg Ådin (Huldrelokkk) playing the Nyckelharpa at the music festival [[Bardentreffen]] in [[Nuremberg]], 2015.](https://commons.wikimedia.org/wiki/Special:FilePath/Huldrelokkk Bardentreffen 15 5481.jpg?width=200 "Mia Gundberg Ådin (Huldrelokkk) playing the Nyckelharpa at the music festival [[Bardentreffen]] in [[Nuremberg]], 2015.")
Trace (linear algebra)
SUM OF THE ELEMENTS OF THE MAIN DIAGONAL OF A SQUARE MATRIX
Trace of a matrix; Trace of a square matrix; Matrix trace; Trace-free; Trace (matrix); Traceless; Trace of an endomorphism; Trace matrix; Trace (mathematics); Trace function; Exponential trace; Trace of a linear operator
In linear algebra, the trace of a square matrix , denoted , is defined to be the sum of elements on the main diagonal (from the upper left to the lower right) of . The trace is only defined for a square matrix ().
Signal trace
WIRE EMBEDDED IN A PRINTED CIRCUIT BOARD, FOR CONDUCTING ELECTRICAL SIGNALS
Circuit trace
In electronics, a signal trace or circuit trace on a printed circuit board (PCB) or integrated circuit (IC) is the equivalent of a wire for conducting signals. Each trace consists of a flat, narrow part of the copper foil that remains after etching.
Trace class
COMPACT OPERATOR FOR WHICH A FINITE TRACE CAN BE DEFINED
Trace-class; Trace class operator; Trace-class operator; Trace of an operator
In mathematics, specifically functional analysis, a trace-class operator is a linear operator for which a trace may be defined, such that the trace is a finite number independent of the choice of basis used to compute the trace. This trace of trace-class operators generalizes the trace of matrices studied in linear algebra.
Википедия
Nyckelharpa
A nyckelharpa (Swedish: [ˈnʏ̂kːɛlˌharːpa], "keyed fiddle", or literally "key harp", plural nyckelharpor) is the national musical instrument of Sweden. It is a string instrument or chordophone. Its keys are attached to tangents which, when a key is depressed, serve as frets to change the pitch of the string.
The nyckelharpa is similar in appearance to a fiddle or the big Sorb geige or viol. Structurally, it is more closely related to the hurdy-gurdy, both employing key-actuated tangents to change the pitch.
