Gert K. Pedersen's Analysis Now PDF

By Gert K. Pedersen

ISBN-10: 0387967885

ISBN-13: 9780387967882

ISBN-10: 3540967885

ISBN-13: 9783540967880

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Example text

What will the total energy cost be next year? How much has the total energy cost changed from the first to the second year? What are these same quantities the following year? Now choose appropriate variables and carefully express the conditions of the problem in terms of your variables and their changes. For example, let P equal the population at time t (in years) and let E equal the per capita expenditure at time t. The total energy expenditure then is T — P x E. These are all functions of time, P = P[t], E = E[t], and T = T[t].

You could compute i without a differential equation, if you knew s. Since everyone is either susceptible or infectious, s + i = 1 and i = 1 — s. 3. Express the differential equation for s without using i? The last hint means that you can either use the system of differential equations for both s and % or use a single differential equation for 5 and solve for i — 1 — s algebraically. 4. The Computer and Your S-I-S Model Use one of the equivalent mathematical models from the previous exercises to modify the main computation of the computer program SIRsolver to compute the course of an S-I-S epidemic.

A. 56, 1984, if you wish to study that disease. 21 In order to build a model that makes predictions for all large well-mixed populations, we make our main variables the continuous fractional variables similar to the ones in Chapter 2 of the core text. 2. t = T h e Continuous S-I-S Variables time measured in days continuously from t=0 at the start of the epidemic . r . i . ii number susceptible r i the traction of the population that is susceptible = n . . r . number infected r r . % = the traction or the population that is infected = n where n is the (fixed) size of the total population.

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Analysis Now by Gert K. Pedersen


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