In bifurcation theory, a field within mathematics, a transcritical bifurcation is a particular kind of local bifurcation, meaning that it is characterized by an equilibrium having an eigenvalue whose real part passes through zero.
A transcritical bifurcation is one in which a fixed point exists for all values of a parameter and is never destroyed. However, such a fixed point interchanges its stability with another fixed point as the parameter is varied.[1] In other words, both before and after the bifurcation, there is one unstable and one stable fixed point. However, their stability is exchanged when they collide. So the unstable fixed point becomes stable and vice versa.
This equation is similar to the logistic equation, but in this case we allow and to be positive or negative (while in the logistic equation and must be non-negative). The two fixed points are at and . When the parameter is negative, the fixed point at is stable and the fixed point is unstable. But for , the point at is unstable and the point at is stable. So the bifurcation occurs at .
A typical example (in real life) could be the consumer-producer problem where the consumption is proportional to the (quantity of) resource.
For example:
where
is the logistic equation of resource growth; and
is the consumption, proportional to the resource .
Referencesedit
^Strogatz, Steven (2001). Nonlinear dynamics and chaos: with applications to physics, biology, chemistry, and engineering. Boulder: Westview Press. ISBN0-7382-0453-6.
January 01, 1970
transcritical, bifurcation, bifurcation, theory, field, within, mathematics, transcritical, bifurcation, particular, kind, local, bifurcation, meaning, that, characterized, equilibrium, having, eigenvalue, whose, real, part, passes, through, zero, normal, form. In bifurcation theory a field within mathematics a transcritical bifurcation is a particular kind of local bifurcation meaning that it is characterized by an equilibrium having an eigenvalue whose real part passes through zero The normal form of a transcritical bifurcation where r ranges from 5 to 5 A transcritical bifurcation is one in which a fixed point exists for all values of a parameter and is never destroyed However such a fixed point interchanges its stability with another fixed point as the parameter is varied 1 In other words both before and after the bifurcation there is one unstable and one stable fixed point However their stability is exchanged when they collide So the unstable fixed point becomes stable and vice versa The normal form of a transcritical bifurcation is d x d t r x x 2 displaystyle frac dx dt rx x 2 This equation is similar to the logistic equation but in this case we allow r displaystyle r and x displaystyle x to be positive or negative while in the logistic equation x displaystyle x and r displaystyle r must be non negative The two fixed points are at x 0 displaystyle x 0 and x r displaystyle x r When the parameter r displaystyle r is negative the fixed point at x 0 displaystyle x 0 is stable and the fixed point x r displaystyle x r is unstable But for r gt 0 displaystyle r gt 0 the point at x 0 displaystyle x 0 is unstable and the point at x r displaystyle x r is stable So the bifurcation occurs at r 0 displaystyle r 0 A typical example in real life could be the consumer producer problem where the consumption is proportional to the quantity of resource For example d x d t r x 1 x p x displaystyle frac dx dt rx 1 x px where r x 1 x displaystyle rx 1 x is the logistic equation of resource growth and p x displaystyle px is the consumption proportional to the resource x displaystyle x References edit Strogatz Steven 2001 Nonlinear dynamics and chaos with applications to physics biology chemistry and engineering Boulder Westview Press ISBN 0 7382 0453 6 Retrieved from https en wikipedia org w index php title Transcritical bifurcation amp oldid 964099697, wikipedia, wiki, book, books, library,