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Что (кто) такое tetrad$82575$ - определение

IRREDUCIBLE NODAL SURFACE

Kummer's surface; Rosenheim tetrad; Gopel tetrad; Göpel tetrad

Tetrad (astronomy)

A SET OF FOUR TOTAL LUNAR ECLIPSES WITHIN TWO YEARS

Lunar tetrad

In astronomy, a tetrad is a set of four total lunar eclipses within two consecutive years. Total Penumbral lunar eclipses, Jean Meeus, 1980

https://en.wikipedia.org/wiki/Tetrad_(astronomy)

Tetrad (music)

SET OF FOUR NOTES IN MUSIC THEORY. WHEN THESE FOUR NOTES FORM A TERTIAN CHORD THEY ARE MORE SPECIFICALLY CALLED A SEVENTH CHORD, AFTER THE DIATONIC INTERVAL FROM THE ROOT OF THE CHORD TO ITS FOURTH NOTE (IN ROOT POSITION CLOSE VOICING)

A tetrad is a set of four notes in music theory. When these four notes form a tertian chord they are more specifically called a seventh chord, after the diatonic interval from the root of the chord to its fourth note (in root position close voicing).

https://en.wikipedia.org/wiki/Tetrad_(music)

tetrad

WIKIMEDIA DISAMBIGUATION PAGE

Tetrads; Tetrad (disambiguation); Tetrade; Tetrade (disambiguation)

['t?trad]

¦ noun technical a group or set of four.

Origin

C17: from Gk tetras, tetrad- 'four, a group of four'.

Википедия

Kummer surface

In algebraic geometry, a Kummer quartic surface, first studied by Ernst Kummer (1864), is an irreducible nodal surface of degree 4 in $\mathbb {P} ^{3}$ with the maximal possible number of 16 double points. Any such surface is the Kummer variety of the Jacobian variety of a smooth hyperelliptic curve of genus 2; i.e. a quotient of the Jacobian by the Kummer involution x ↦ −x. The Kummer involution has 16 fixed points: the 16 2-torsion point of the Jacobian, and they are the 16 singular points of the quartic surface. Resolving the 16 double points of the quotient of a (possibly nonalgebraic) torus by the Kummer involution gives a K3 surface with 16 disjoint rational curves; these K3 surfaces are also sometimes called Kummer surfaces.

Other surfaces closely related to Kummer surfaces include Weddle surfaces, wave surfaces, and tetrahedroids.

https://en.wikipedia.org/wiki/Kummer surface