Given an interaction model between two populations.
Given an interaction model between two populations.
What assumptions are used in that model, including the type of Interaction between the two populations
Determine all equilibrium points and determine the stability and type of Stability of each equilibrium point (linearity of the system Method)
Draw a phase plane and sketch the solution curve around the equilibrium point
Homework Answers
1. The populations of two competing species x(t) and y(t) are governed by the non-linear system...
1. The populations of two competing species x(t) and y(t) are governed by the non-linear system of differential equations dx dt 10x – x2 – 2xy, dy dt 5Y – 3y2 + xy. (a) Determine all of the critical points for the population model. (b) Determine the linearised system for each critical point in part (a) and discuss whether it can be used to approximate the behaviour of the non-linear system. (c) For the critical point at the origin: (i)...
The following system can be interpreted as a competition system describing the interaction of two species...
The following system can be interpreted as a competition system describing the interaction of two species with populations x(t) and y(t) x' 40x – 22 – ry y' = 30y - y2 – 0.5xy This system has four critical points (0,0), (0, 30), (40,0), and (20, 20). (a) At critical point (20, 20), find the linearization of the system and its eigenvalues. Deter- mine the type and stability of the critical point (20, 20). Base on your work in part...
This is a differential equations problem 2. Given the system of differential equations 0.2 0.005ry, --0.5y+0.01ry, w...
This is a differential equations problem
2. Given the system of differential equations 0.2 0.005ry, --0.5y+0.01ry, which models the rates of changes of two interacting species populations, describe the type of z- and y-populations involved (exponential or logistic) and the nature of their interaction (competition, cooperation, or predation). Then find and characterize the system's critical points (type and stability). Determine what nonzero r- and y-populations can coexist. Ther construct a phase plane portrait that enables you to describe the long...
a) Interaction between two interaction between the species is described by the following system. (A) fixed points. Assume 0 and y 2 0. (only 1st qundrant) species. Let r and y represent the popul...
a) Interaction between two interaction between the species is described by the following system. (A) fixed points. Assume 0 and y 2 0. (only 1st qundrant) species. Let r and y represent the populations of two species. The assify the Find and el (B) Sketch the phase portrait. Show only the 1st quadrant. Include nullelines. (C) Interpret your results in terms of the two species.
a) Interaction between two interaction between the species is described by the following system. (A)...
3. Consider the following system of autonomous differential equations for the populations of two ...
Please solve the following problem, solve all parts
3. Consider the following system of autonomous differential equations for the populations of two species: dx dt dy dt --0.2y0.0004 ry 0.1 x 0.001 ry a) What type of system might this represent (and why) ? b) Are there equilibria? If yes, what are they? c) Perform a graphical analysis and sketch some trajectories in the phase plane. Comment on the stability of any equilibria. d) What would you predict for the...
1. (This is problem 5 from the second assignment sheet, reprinted here.) Consider the nonlinear system a. Sketch the ulllines and indicate in your sketch the direction of the vector field in each...
1. (This is problem 5 from the second assignment sheet, reprinted here.) Consider the nonlinear system a. Sketch the ulllines and indicate in your sketch the direction of the vector field in each of the regions b. Linearize the system around the equilibrium point, and use your result to classify the type of the c. Use the information from parts a and b to sketch the phase portrait of the system. 2. Sketch the phase portraits for the following systems...
Please show all work and answer ASAP!! 5) Consider the epidemic model x' = -3.cy -0.5.0...
Please show all work and answer
ASAP!!
5) Consider the epidemic model x' = -3.cy -0.5.0 + 0.5 y' = 3.cy - 1.5y Find all the equilibrium points and determine their type and stability type. Show the equilibrium points on the (x,y)-plane and sketch the phase portrait near each equilibrium showing the direction of trajectories. For saddles/nodes show the eigenvectors; for spirals determine the direction of rotation.
1. The Duffing equation is a non-linear second-order differential equation used to model certain damped and...
1. The Duffing equation is a non-linear second-order differential equation used to model certain damped and driven oscillators. The equation is given by -ax+3x3 = cos(wt) at medt dr. where function r = r(t) is the displacement at timet, is the velocity, and is the acceleration. The parameter 8 controls the amount of damping, a controls the linear stiffness, B controls the amount of non-linearity in the restoring force, and 7 and w are the amplitude and angular frequency of...
1. Consider the Lotka-Volterra model for the interaction between a predator population (wolves W(t)) and a...
1. Consider the Lotka-Volterra model for the interaction between a predator population (wolves W(t)) and a prey population (moose M(t)), À = aM - bmw W = -cW+dMW with the four constants all positive. (a) Explain the meaning of the terms. (b) Non-dimensionalize the equations in the form dx/dt = *(1 - y) and dy/dt = xy(x - 1). (c) Find the fixed points, linearize, classify their stability and draw a phase diagram for various initial conditions (again, using a...
Question 1: (5 marks) Consider a two-species model for populations Ni and N2 follows as N1 (a -bN1 cN2) dt N2 (d -...
Question 1: (5 marks) Consider a two-species model for populations Ni and N2 follows as N1 (a -bN1 cN2) dt N2 (d - eN2 - Ni) dt (a) What kind of interaction does this system of equations represent? (b) Show that the equations can be simplified to dn1 an n1 (1 d7 dn2 Bn2 (1n2-n1). dT mT into the system of equations and picking by substituting N = kn\, N2 = ln2 and t appropriate constants k, l and m...
1. The populations of two competing species x(t) and y(t) are governed by the non-linear system of differential equations dx dt 10x – x2 – 2xy, dy dt 5Y – 3y2 + xy. (a) Determine all of the critical points for the population model. (b) Determine the linearised system for each critical point in part (a) and discuss whether it can be used to approximate the behaviour of the non-linear system. (c) For the critical point at the origin: (i)...
The following system can be interpreted as a competition system describing the interaction of two species with populations x(t) and y(t) x' 40x – 22 – ry y' = 30y - y2 – 0.5xy This system has four critical points (0,0), (0, 30), (40,0), and (20, 20). (a) At critical point (20, 20), find the linearization of the system and its eigenvalues. Deter- mine the type and stability of the critical point (20, 20). Base on your work in part...
This is a differential equations problem
2. Given the system of differential equations 0.2 0.005ry, --0.5y+0.01ry, which models the rates of changes of two interacting species populations, describe the type of z- and y-populations involved (exponential or logistic) and the nature of their interaction (competition, cooperation, or predation). Then find and characterize the system's critical points (type and stability). Determine what nonzero r- and y-populations can coexist. Ther construct a phase plane portrait that enables you to describe the long...
a) Interaction between two interaction between the species is described by the following system. (A) fixed points. Assume 0 and y 2 0. (only 1st qundrant) species. Let r and y represent the populations of two species. The assify the Find and el (B) Sketch the phase portrait. Show only the 1st quadrant. Include nullelines. (C) Interpret your results in terms of the two species.
a) Interaction between two interaction between the species is described by the following system. (A)...
Please solve the following problem, solve all parts
3. Consider the following system of autonomous differential equations for the populations of two species: dx dt dy dt --0.2y0.0004 ry 0.1 x 0.001 ry a) What type of system might this represent (and why) ? b) Are there equilibria? If yes, what are they? c) Perform a graphical analysis and sketch some trajectories in the phase plane. Comment on the stability of any equilibria. d) What would you predict for the...
1. (This is problem 5 from the second assignment sheet, reprinted here.) Consider the nonlinear system a. Sketch the ulllines and indicate in your sketch the direction of the vector field in each of the regions b. Linearize the system around the equilibrium point, and use your result to classify the type of the c. Use the information from parts a and b to sketch the phase portrait of the system. 2. Sketch the phase portraits for the following systems...
Please show all work and answer
ASAP!!
5) Consider the epidemic model x' = -3.cy -0.5.0 + 0.5 y' = 3.cy - 1.5y Find all the equilibrium points and determine their type and stability type. Show the equilibrium points on the (x,y)-plane and sketch the phase portrait near each equilibrium showing the direction of trajectories. For saddles/nodes show the eigenvectors; for spirals determine the direction of rotation.
1. The Duffing equation is a non-linear second-order differential equation used to model certain damped and driven oscillators. The equation is given by -ax+3x3 = cos(wt) at medt dr. where function r = r(t) is the displacement at timet, is the velocity, and is the acceleration. The parameter 8 controls the amount of damping, a controls the linear stiffness, B controls the amount of non-linearity in the restoring force, and 7 and w are the amplitude and angular frequency of...
1. Consider the Lotka-Volterra model for the interaction between a predator population (wolves W(t)) and a prey population (moose M(t)), À = aM - bmw W = -cW+dMW with the four constants all positive. (a) Explain the meaning of the terms. (b) Non-dimensionalize the equations in the form dx/dt = *(1 - y) and dy/dt = xy(x - 1). (c) Find the fixed points, linearize, classify their stability and draw a phase diagram for various initial conditions (again, using a...
Question 1: (5 marks) Consider a two-species model for populations Ni and N2 follows as N1 (a -bN1 cN2) dt N2 (d - eN2 - Ni) dt (a) What kind of interaction does this system of equations represent? (b) Show that the equations can be simplified to dn1 an n1 (1 d7 dn2 Bn2 (1n2-n1). dT mT into the system of equations and picking by substituting N = kn\, N2 = ln2 and t appropriate constants k, l and m...
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