irreducible cut - определение. Что такое irreducible cut
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Что (кто) такое irreducible cut - определение

ONE CASE WHEN SOLVING A CUBIC EQUATION
Irreducible Case; Irreducible Case (cubic); Irreducible cubic

cut glass         
  • Contemporary Czech cut glass in two colours
  • Czech glass-cutter at work
  • Chandelier in the chapel of [[Emmanuel College, Cambridge]], donated in 1732, one of the earliest datable cut glass examples.  The shape follows contemporary brass examples, with glass branches but no "drops"; only the pieces down the stem are cut, mostly with flat facets.<ref>Battie & Cottle, 102</ref>
  • American "brilliant cut" [[punch bowl]] on stand, 1895
  • Montgolfier]]" shape (due to its resemblance to an inverted [[hot air balloon]]),<ref>History</ref> in [[Edinburgh]]
  • Regency]] chandeliers in [[Saltram House]], England
  • [[Waterford Crystal]] factory in 2001
  • engraving]] above, England, late 18th-century
GLASS DECORATED WITH GEOMETRICAL OR REPRESENTATIONAL INCISIONS MADE BY GRINDING AND POLISHING
Cut-glass accent; Cut-glass; Cut crystal
also cut-glass
Cut glass is glass that has patterns cut into its surface.
...a cut-glass bowl.
N-UNCOUNT: oft N n
cut-glass         
  • Contemporary Czech cut glass in two colours
  • Czech glass-cutter at work
  • Chandelier in the chapel of [[Emmanuel College, Cambridge]], donated in 1732, one of the earliest datable cut glass examples.  The shape follows contemporary brass examples, with glass branches but no "drops"; only the pieces down the stem are cut, mostly with flat facets.<ref>Battie & Cottle, 102</ref>
  • American "brilliant cut" [[punch bowl]] on stand, 1895
  • Montgolfier]]" shape (due to its resemblance to an inverted [[hot air balloon]]),<ref>History</ref> in [[Edinburgh]]
  • Regency]] chandeliers in [[Saltram House]], England
  • [[Waterford Crystal]] factory in 2001
  • engraving]] above, England, late 18th-century
GLASS DECORATED WITH GEOMETRICAL OR REPRESENTATIONAL INCISIONS MADE BY GRINDING AND POLISHING
Cut-glass accent; Cut-glass; Cut crystal
cut glass         
  • Contemporary Czech cut glass in two colours
  • Czech glass-cutter at work
  • Chandelier in the chapel of [[Emmanuel College, Cambridge]], donated in 1732, one of the earliest datable cut glass examples.  The shape follows contemporary brass examples, with glass branches but no "drops"; only the pieces down the stem are cut, mostly with flat facets.<ref>Battie & Cottle, 102</ref>
  • American "brilliant cut" [[punch bowl]] on stand, 1895
  • Montgolfier]]" shape (due to its resemblance to an inverted [[hot air balloon]]),<ref>History</ref> in [[Edinburgh]]
  • Regency]] chandeliers in [[Saltram House]], England
  • [[Waterford Crystal]] factory in 2001
  • engraving]] above, England, late 18th-century
GLASS DECORATED WITH GEOMETRICAL OR REPRESENTATIONAL INCISIONS MADE BY GRINDING AND POLISHING
Cut-glass accent; Cut-glass; Cut crystal
¦ noun
1. glass that has been decorated by having patterns cut into it by grinding and polishing.
2. [as modifier] characterized by precise enunciation: a cut-glass accent.

Википедия

Casus irreducibilis

In algebra, casus irreducibilis (Latin for "the irreducible case") is one of the cases that may arise in solving polynomials of degree 3 or higher with integer coefficients algebraically (as opposed to numerically), i.e., by obtaining roots that are expressed with radicals. It shows that many algebraic numbers are real-valued but cannot be expressed in radicals without introducing complex numbers. The most notable occurrence of casus irreducibilis is in the case of cubic polynomials that have three real roots, which was proven by Pierre Wantzel in 1843. One can see whether a given cubic polynomial is in so-called casus irreducibilis by looking at the discriminant, via Cardano's formula.