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Qu'est-ce (qui) est functionally invariant - définition

END OF VIABILITY FOR A POPULATION

Functionally extinct

Invariant (physics)

IN MATHEMATICS AND THEORETICAL PHYSICS, PROPERTY OF A SYSTEM WHICH REMAINS UNCHANGED UNDER SOME TRANSFORMATION

Invariance (physics); Invariant quantity

In theoretical physics, an invariant is an observable of a physical system which remains unchanged under some transformation. Invariance, as a broader term, also applies to the no change of form of physical laws under a transformation, and is closer in scope to the mathematical definition.

https://en.wikipedia.org/wiki/Invariant_(physics)

Invariant (mathematics)

$operation]] denoted by <math>\circ</math> is the [[function composition]].$

PROPERTY OF MATHEMATICAL OBJECTS THAT REMAINS UNCHANGED FOR TRANSFORMATIONS APPLIED TO THE OBJECTS

Invariant (computer science); Invariance (mathematics); Coordinate system invariant; Invariant set; Coordinate invariance; Coordinate system invariance; Programming invariant

In mathematics, an invariant is a property of a mathematical object (or a class of mathematical objects) which remains unchanged after operations or transformations of a certain type are applied to the objects. The particular class of objects and type of transformations are usually indicated by the context in which the term is used.

https://en.wikipedia.org/wiki/Invariant_(mathematics)

U-invariant

MATHEMATICAL TERM

Universal invariant; General u-invariant

In mathematics, the universal invariant or u-invariant of a field describes the structure of quadratic forms over the field.

https://en.wikipedia.org/wiki/U-invariant

Wikipédia

Functional extinction

Functional extinction is the extinction of a species or other taxon such that:

It disappears from the fossil record, or historic reports of its existence cease;
The reduced population no longer plays a significant role in ecosystem function; or
The population is no longer viable. There are no individuals able to reproduce, or the small population of breeding individuals will not be able to sustain itself due to inbreeding depression and genetic drift, which leads to a loss of fitness.

In plant populations, self-incompatibility mechanisms may cause related plant specimens to be incompatible, which may lead to functional extinction if an entire population becomes self-incompatible. This does not occur in larger populations.

In polygynous populations, where only a few males leave offspring, there is a much smaller reproducing population than if all viable males were considered. Furthermore, the successful males act as a genetic bottleneck, leading to more rapid genetic drift or inbreeding problems in small populations.

https://en.wikipedia.org/wiki/Functional extinction