# Die Lie-Reihen und ihre Anwendungen by Groebner W. By Groebner W.

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This chapter will investigate ODEs and initial value problems, their solutions, and their solution curves, along with some methods for finding solution formulas. Slope fields are introduced and used as guides to the behavior of solution curves. The path of a juggler’s ball and the descent of a sky diver are modeled by ODEs. Key words Differential equation; solution; integration; separation of variables; initial values; modeling; slope field; direction field; juggling; sky diving; free fall; parachute; gravity; Newton’s second law See also Chapter 1 for more on modeling, and Chapter 5 for more on models of motion.

Its solution is y = 2t2 + 3. ✓ Replace the condition y(1) = 5 in IVP (2) by y(2) = 3 and find the solution of this new initial value problem. How many solutions are there? ◆ Finding a Solution Formula An ODE usually has many solutions. How can you find a solution, and how can you describe it? A solution formula provides a useful description, but graphs and tables generated by ODE Architect are also useful, especially in the all-too-frequent case where no formula can be found. Two techniques to find solution formulas are summarized here, and others are in your textbook.

7 . The Ricker population model. 7) This function exhibits “compensatory behavior” that biologists know many fish populations exhibit. Plot two sardine populations vs. time on the same set of axes for comparison: sardine1 as per the Ricker function above and sardine2 as per the logistic growth model used earlier. You have to select the 2D tab on the graphics window when defining the graph to get both populations on the same graph. To compare their respective growth patterns, plot the two sardine populations from 1920 to 1960 (# Points = 40) with IC set to 1 on both plots and with no harvesting.