MathBio HW6, due Wed April 16

1. A cooperation model. Consider the following two-species model. where , and are positive constants. Under what circumstances is there a positive coexistence equilibrium? In the case where there exists a positive equilibrium, find ALL equilibria, determine their stability and sketch the phase plane. What does the phase plane look like when there is noContinue reading “MathBio HW6, due Wed April 16”

MathBio: Gearing up for Test 2

If you a looking for problems to work on to prepare for Midterm 2, this post will be the place to look.  This will be updated several times over the next few days. Challenge problems for discrete-time systems. Solutions to the important parts of the Horseshoe Crab project are written up here: Horseshow crabs 1a  Continue reading “MathBio: Gearing up for Test 2”

MathBio: The Basic Horseshoe Crab Model

During the last class before spring break, we were visited by Daniel Sasson from the Biology Department, a horseshoe crab expert and mathematical modeling enthusiast.  We presented several versions of our models for the “Blood Harvest” we discussed in Wednesday’s class and he advised us on some parameter values that make sense.  Our general conclusionsContinue reading “MathBio: The Basic Horseshoe Crab Model”

MathBio: Homework 4, Due Wed Feb 26

One problem, due Wed Feb 26 ————————————————— (Logan and Wolesenksy, 3.3 #2) In 1998, van der Meijden described the following model connecting the cinnabar moth and ragweed.  The life cycle of the moth is as follows.  It lives for one year, lays its eggs on the plant, and dies. The eggs hatch the next spring.Continue reading “MathBio: Homework 4, Due Wed Feb 26”