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A radical ideal is an ideal that equals its own radical. In a polynomial ring k [ x 1 , … , x n ] {\displaystyle k[x_{1},\ldots ,x_{n}]} over a field k , an ideal is radical if and only if it is the set of all polynomials that are zero on an affine algebraic set (this is a consequence of Hilbert's Nullstellensatz ).
The radicand is the number or expression underneath the radical sign, in this case, 9. For non-negative x , the principal square root can also be written in exponent notation, as x 1 / 2 {\displaystyle x^{1/2}} .
The history of scientific method considers changes in the methodology of scientific inquiry, not the history of science itself. The development of rules for scientific reasoning has not been straightforward; scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the primacy of ...
In biology, parts of the DNA double helix that need to separate easily, such as the TATAAT Pribnow box in some promoters, tend to have a high AT content, making the strands easier to pull apart. [29] In the laboratory, the strength of this interaction can be measured by finding the melting temperature T m necessary to break half of the hydrogen ...
Changes in a population's allele frequency following a population bottleneck: the rapid and radical decline in population size has reduced the population's genetic variation. A population bottleneck is when a population contracts to a significantly smaller size over a short period of time due to some random environmental event.
Postlewayt's Universal Dictionary, a contemporary source giving technological information in Europe, did not mention zinc before 1751 but the element was studied before then. [84] [97] Flemish metallurgist and alchemist P. M. de Respour reported that he had extracted metallic zinc from zinc oxide in 1668. [36]
Burning Man is a week-long large-scale desert event focused on "community, art, self-expression, and self-reliance" held annually in the western United States. [1] [2] The event's name comes from its culminating ceremony: the symbolic burning of a large wooden effigy, referred to as the Man, that occurs on the penultimate night, the Saturday evening before Labor Day. [3]
The group attracted people from across the political spectrum, although most of its members were from families that supported the Conservative party, people for whom British fascism was "a more staunch expression of their toryism, a surer way to preserve the empire, support the monarchy, and continue to agitate for an ethnically homogeneous ...