Typos and Errata
for
Third Printing


Last updated Jan. 26, 2009



p. 19. use "[ ]" instead of "{ }" in the implicitplot line in Maple code:
implicitplot([eq2,eq3,eq4,eq5,eq6,eq7,eq8,eq9], x=...rest is okay);

The code will run fine with "{ }" but you cannot use the "color" option with it.

p. 62, Computer Code 1.9 for Matlab: M-file is called Example5.m. Thus we need to change the call to it (first line on p. 63) to 'Example5.m'.

p. 161, Computer Code 3.1 for Maple: Remove "diff" from 3rd line, 4th line, and 5th line in order to have example match up with that of Matlab and Mathematica.

p. 231. The appropriate change of variables is "x=e^t".

p. 240. Right-hand-side of problem #3 should be cos(3x) for the first ODE and 12 cos(3x) for the second ODE.

p. 252, Computer Code 4.4 for Maple: Need "eval" around rhs of 3rd line. Code should read
eq1:=eval(simplify(subs(eqyp, eqODE)));

p. 315. Formula (3.15) is wrong and should be corrected in ALL corresponding places (for example, both equations before it, the one after it, etc.) as:
int((1/f^2)*exp(int(-a1/a0)dx)dx)
That is, the f^2 in the denominator needs to be outside of the exponential. The c does not need to be there.

p. 330. Delete "and eigenvalues" from the third sentence. It should read
However, students often prefer to have "nicer looking" eigenvectors.
p. 367. Insert the following sentences immediately preceding Remark 1:
"Important note: we point out that the above method won't work for any arbitrary basis of eigenvectors but will always work for some basis of eigenvectors. That is, in certain situations we may not be able to get past step (a) and the problem is that we need to choose a different basis from which to start. Starting from a "good" basis allows the above algorithm to work and we mention the following: Remark 1..."


p. 430. Second equation (integral of exp(-st)*sin(bt)dt...). Insert a minue sign between the two fractions on the rhs.

p. 444. In Theorem 7.3.1, remove from the 2nd part of piecewise definition the ">". That part should read:
f(t-a), t "greater than or equal to" a.
p. 451. In Problem #5, last inequality should read:
0, t>5.
p. 572. Rewrite the function on the rhs of ans1:
ans1=nthroot(x^2+y^2,4);

p. 644, answer to 4.7#3: The solution should be y(x)=-1+cos(x)+sin(x)+ln(sec(x)+tan(x))*sin(x).



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Send additional ones to:
Randall Swift (e-mail: rjswift "at" csupomona "dot" edu)
or
Stephen Wirkus (e-mail: swirkus "at" asu "dot" edu)