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

Symmetry (physics)         
FEATURE OF A SYSTEM THAT IS PRESERVED UNDER SOME TRANSFORMATION
Internal symmetry; Global symmetry; Isometries in physics; Local symmetry; Internal symmetries; Symmetry in physics; Symmetry transformations
In physics, a symmetry of a physical system is a physical or mathematical feature of the system (observed or intrinsic) that is preserved or remains unchanged under some transformation.
mirror symmetry         
  • A [[normal distribution]] bell curve is an example symmetric function
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  • Many animals, such as this [[spider crab]] ''[[Maja crispata]]'', are bilaterally symmetric.
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  • Mirror symmetry is often used in [[architecture]], as in the facade of [[Santa Maria Novella]], [[Florence]], 1470.
SYMMETRY WITH RESPECT TO A PLANE, WHEN THE SHAPE DOES NOT CHANGE BY REFLECTING ALL OF ITS PART FROM A MIRROR PLANE
Plane of symmetry; Line of symmetry; Mirror Symmetry; Reflectional symmetry; Axes of symmetry; Line symmetry; Reflective symmetry; Reflection symmetries; Mirror symmetric; Linear symmetry; Mirror symmetry
¦ noun symmetry about a plane, like that between an object and its reflection.
Rotational symmetry         
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SYMMETRY (SOMETHING LOOKING THE SAME) UNDER ROTATION
Rotation symmetry; Axisymmetric; Rotational Symmetry; Trilateral symmetry; Rotational symmetric; Rotational symetry; Axisymmetrical; Axisymmetry; Symmetry axis; Rotational symmetries; Rotationally symmetric; Pinwheeling; Rationally symmetrical; Rotationally symmetrical; Discrete rotational symmetry
Rotational symmetry, also known as radial symmetry in geometry, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation.

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.