Below are the errors we are aware of in the text. Of course if you've found any others we want to hear about them. Please email us at the link at the bottom of the page.

**Page 20:**Problem 1.43 should have a**/**in both the differential equation and the solution:(1-2xy) **/**(x^2+1) and (C+x)**/**(x^2+1)

(In the solution manual Part b of this problem is written as if the given solution were a product, but it should be written for a quotient as indicated here.)**Page 116:**Problems 3.47 and 3.48 refer to "magnitude" when they should say "modulus." Problem 3.48 also says "angle" when it should say "phase."**Page 174:**The paragraph toward the bottom of the page (beginning "Recall that a critical point") has two minor errors. In the equation 40-L^{2}-12LH=0, substitute 3L^{2}for the middle term; in the phrase "Solving these two equations simultaneous" substitute "simultaneously" for the fifth word.**Page 195:**Problem 5.2 Part (a) says "for the first integral" when it should say "for the first interval."**Page 207:**The next-to-last sentence in the "Double Integral" example ("The constant sigma also appeared...the problem was using.") came from a completely different scenario, and makes no sense in this one. Ignore it and the rest of the example makes sense.**Page 233:**The final solution to the "Example" gives the spherical coordinates of points A, B, and C in the order (r,phi,theta) rather than the correct order (r,theta,phi).**Page 245:**Problem 5.205 says (vector) f(x,y) where it should say (vector) f(x,y,z).**Page 299:**Equation 6.5.1 shows e times the column (a,c) plus f times the column (b,d). The second term should be g times (b,d), not f.**Page 307:**The upper-right-hand corner of**X**^{-1}should be -17/18, not 17/18 as written. This error appears in two separate equations, but the final result (molecules of methane and butane) is correct.**Page 314:**The box in the middle of the page is correct. However, in the sentence immediately*below*that box, substitute "linearly dependent" for the incorrect phrase "linearly independent."**Page 324:**Problem 6.161 works as written if you treat it as pure math, but cannot correspond to a physical three-spring scenario. It makes a useful exercise for students to explore why this is so.**Online Section 7.5, Page 21:**Problem 7.106 says "the bottom edge has F=0" when it should say "the left edge has F=0."**Pages 388-389:**The Earth-moon example has two problems. First, it assigns the Earth a mass six times that of the moon. This makes for a good example, but we should have clearly stated (at least in a footnote) that the actual ratio is more like 81 to 1. Second, Equation 8.3.1 does not have a maximum of -0.3 (as the text says) or -0.03 (as the graph says), but of -0.03GM.**Page 401:**Problem 8.63 ends with the phrase "throughout the room." That should be replaced with "on the surface of the table." It also would be a clearer problem if it specified the dimensions of the table, so at the end of the problem it should say "Assume the surface of the table extends from (-2,-2) to (2,7)." If a student hadn't seen this correction and chose their own dimensions that would be fine as long as it included the two light sources.**Page 437:**Problem 8.169 Part (e) uses the phrase "total contribution*go*the curl" instead of "total contribution*to*the curl" as it should.**Online Section 8.12, Page 1:**Problem 8.200 should have "v=" at the start.**Page 464:**In the paragraph just above the Example, change "slightly higher than G5" to A5.**Page 465:**In Problem 9.42 Part (d), change "next largest period" to "next smallest period."**Page 482:**The instructions for Problems 9.79-9.83 should say "Label the p-values" (not "the x-values") on the horizontal axis.**Online Section 10.3, Page 10:**In Problem 10.61 ("Inflationary Cosmology") the equation is missing phidot (a phi with a dot over it) in front of the square root.**Online Section 10.6, Page 27:**The "Check Yourself" for Part 1 of Discovery Exercise 10.6.1 is #64, not #66. Note that this is correct if you download the standalone Discovery Exercise, but incorrect if you download the entire section.**Page 563:**Problem 11.52 Part (c) says "you found Part (b)." It should say "you found in Part (b)."**Page 658:**The third paragraph says "can made from" instead of "can be made from."**Page 670:**In the paragraph just below the equation at the top, the phrase "replacing n with n+1 in the first derivative" should say "replacing n with n+2 in the first derivative" instead.**Page 703:**The equation for c3 has T2 in the integral, but it should be T3.**Page 750:**In the last sentence before the first diagram, the equation u=4-(y/4)^{2}should read u=4-(v/4)^{2}**Page 753:**The header of a block of problems says "Problems 13.111-13.116" when it should say "Problems 13.111-13.118."**Online Section 13.11, Page 17:**The parts of Problem 13.157 are numbered a, b, c, a, b, c. That should of course be a, b, c, d, e, f.**Page 772:**At the bottom of the page the differential in spherical coordinates should have a d phi in the last term.**Page 778:**At the bottom of the page (below the box) the formula for the divergence theorem in 2D is incorrect on the right side. It should be the integral of f dotted into n-hat, a unit normal to the curve, times the scalar ds, as shown below.