inverse astigmatism - ορισμός. Τι είναι το inverse astigmatism
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Τι (ποιος) είναι inverse astigmatism - ορισμός

TYPE OF MUSICAL PERMUTATION
Retrograde-inversion; Inverse retrograde; Retrograde inverse; Inverse-retrograde; Retrograde-inverse
  • 978-0-521-68200-8}} (pbk).</ref> P R I IR

Inverse floating rate note         
TYPE OF DEBT INSTRUMENT
Inverse floater
An inverse floating rate note, or simply an inverse floater, is a type of bond or other type of debt instrument used in finance whose coupon rate has an inverse relationship to short-term interest rates (or its reference rate). With an inverse floater, as interest rates rise the coupon rate falls.
Astigmatism         
  • Illustration of astigmatism
REFRACTIVE ERROR CHARACTERIZED BY THE OPTICS OF THE EYE TO FOCUS A POINT OBJECT INTO A SHARP FOCUSED IMAGE ON THE RETINA, HAS_SYMPTOM BLURRED VISION.
Astigamatic; Astygmatism; Astigmia; Wikipedia talk:Articles for creation/The Alpins Method of Astigmatism Analysis; The Alpins method of astigmatism analysis; Alpins astigmatism method; Astigmatic; Astigmatic refractive error; Human astigmatism; Astigmatism (eye)
·noun A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision.
Astigmatism         
  • Illustration of astigmatism
REFRACTIVE ERROR CHARACTERIZED BY THE OPTICS OF THE EYE TO FOCUS A POINT OBJECT INTO A SHARP FOCUSED IMAGE ON THE RETINA, HAS_SYMPTOM BLURRED VISION.
Astigamatic; Astygmatism; Astigmia; Wikipedia talk:Articles for creation/The Alpins Method of Astigmatism Analysis; The Alpins method of astigmatism analysis; Alpins astigmatism method; Astigmatic; Astigmatic refractive error; Human astigmatism; Astigmatism (eye)
Astigmatism is a type of refractive error due to rotational asymmetry in the eye's refractive power. This results in distorted or blurred vision at any distance.

Βικιπαίδεια

Retrograde inversion

Retrograde inversion is a musical term that literally means "backwards and upside down": "The inverse of the series is sounded in reverse order." Retrograde reverses the order of the motif's pitches: what was the first pitch becomes the last, and vice versa. This is a technique used in music, specifically in twelve-tone technique, where the inversion and retrograde techniques are performed on the same tone row successively, "[t]he inversion of the prime series in reverse order from last pitch to first."

Conventionally, inversion is carried out first, and the inverted form is then taken backward to form the retrograde inversion, so that the untransposed retrograde inversion ends with the pitch that began the prime form of the series. In his late twelve-tone works, however, Igor Stravinsky preferred the opposite order, so that his row charts use inverse retrograde (IR) forms for his source sets, instead of retrograde inversions (RI), although he sometimes labeled them RI in his sketches.

For example, the forms of the row from Requiem Canticles are as follows:

 P0: 0 2 t e 1 8 6 7 9 4 3 5
 R0: 5 3 4 9 7 6 8 1 e t 2 0
 I0: 0 t 2 1 e 4 6 5 3 8 9 7
RI0: 7 9 8 3 5 6 4 e 1 2 t 0
IR0: 5 7 6 1 3 4 2 9 e 0 8 t

Note that IR is a transposition of RI, the pitch class between the last pitches of P and I above RI.

Other compositions that include retrograde inversions in its rows include works by Tadeusz Baird and Karel Goeyvaerts. One work in particular by the latter composer, Nummer 2, employs retrograde of the recurring twelve-tone row B–F–F–E–G–A–E–D–A–B–D–C in the piano part. It is performed in both styles, particularly in the outer sections of the piece. The final movement of Hindemith's Ludus Tonalis, the Postludium, is an exact retrograde inversion of the work's opening Praeludium.