ࡱ>  #bjbjΚΚ *VrrBBBBBVVVV,Va"&&&&&&&&!!!!!!!, $&z"B&&&&&"BB&&"&B&B&!&!: ,\! ۂ3$! !1"0a".!.5'5'h!Bh!\&&&""&&&a"5'&&&&&&&&&r :   Section 6.6. Improper integrals What is the main idea of this section? ..?.. ..?.. 1. Integrating a function y = f(x) where either x or y takes on arbitrarily large (positive or negative) values 2. The improper Riemann integral as a limit of proper Riemann integrals 3. The two cases (type I and type II) 4. The special case f(x) = xp. Integrating a function y = f(x) where either x or y takes on arbitrarily large (positive or negative) values: Geometrically, this corresponds to computing the areas of regions that are infinitely wide or infinitely tall. It might not make intuitive sense that such a region could in some cases have a finite area (how could you cover such a region?), but it makes more sense if you switch from trying to cover a region to trying to fit stuff into it. If theres a region of infinite extent that cant accommodate any finite collection of rectangles whose total area exceeds 17, it makes sense to say that the region has useable area 17 or less. Improper integrals of type I: The interval of integration is one-sidedly or two-sidedly unbounded (e.g., [a,() or ((,b] with a,b finite, or ((,()). Examples: (1( (1/x) dx, (1( (1/x2) dx, (0( ex dx, ((( sin x dx. Improper integrals of type II: The interval of integration is bounded, but the integrand is unbounded on that interval. Examples: (01 (1/x) dx, (01 (1/sqrt(x)) dx, (01 (1/(sin x)) dx, (01 x/sqrt(1x2) dx. As well see, improper integrals sometimes have well-defined finite values (convergent improper integrals) and sometimes dont (divergent improper integrals). In every case, the value of an improper integral is defined to be equal to a particular limit of proper integrals (or as a combination of such limits). Type I: We define (a( f(x) dx = limt(( (at f(x) dx. We define ((b f(x) dx = limt(( (tb f(x) dx. We define ((( f(x) dx = (a( f(x) dx + ((a f(x) dx (youll see in the homework that the choice of a doesnt affect the sum; and youll also see why the more obvious definition ((( f(x) dx = limt(( (t t f(x) dx is problematic). Important point: (a( f(x) dx equals limt(( (at f(x) dx if this limit is defined and is undefined otherwise; likewise for the other two improper integrals. Example: Evaluate (0( ex dx.  For all t(0, (0t ex dx = ..?.. ..?.. ex (0t = (et 1) = 1 et, which (as t(() goes to ..?.. ..?.. 1, so (0( ex dx = 1. Example: Evaluate ((( sin x dx.  For all t(0, (0t sin x dx = ..?.. ..?.. (cos x)(0t = (cos t 1) = 1 cos t, which (as t(() ..?.. ..?.. does not converge, so (0( sin x dx does not exist, and neither does ((( sin x dx; that is, these improper integrals are divergent. Example: Evaluate (1( 1/x dx.  For all t(1, (1t 1/x dx = ..?.. ..?.. (ln x)(1t = ln t ln 1 = ln t, which (as t(() ..?.. ..?.. does not converge, so (1( 1/x dx does not exist; that is, this improper integrals is divergent. Beware of vague assertions like 1/x diverges in your cheat-sheets and in your thought-processes. Its true that the integral of 1/x as x goes from 0 to ( diverges, but its not true that 1/x itself diverges as x goes to (; in fact, 1/x converges to 0 as x goes to (. It can be shown that if (1( f(x) dx converges, then f(x) must converge to the limit 0 [draw a picture]. The converse however is not true; if f(x) is a decreasing function that converges to 0 as x((, it is not necessarily the case that (1( f(x) dx converges, as the case f(x) = 1/x shows. Type II: If f is continuous on [a,b) and discontinuous at b, we define (ab f(x) dx = limt(b- (at f(x) dx. If f is continuous on (a,b] and discontinuous at a, we define (ab f(x) dx = limt(a+ (tb f(x) dx. (A case Stewart missed:) If f is continuous on (a,b) and discontinuous at a and b, we define (ab f(x) dx = (ac f(x) dx + (cb f(x) dx where c is between a and b. (Any c can be used; all cs will give the same answer for (ab f(x) dx.) The general case: If f is continuous on [a,b] except at the points c1 < c2 < ... < cn, then we define (ab f(x) dx as a sum of n+1 improper integrals: (ac(1) f(x) dx + (c(1)c(2) f(x) dx + ... + (c(n)b f(x) dx (where I write c(1) for c1, etc.). Note that this includes the cases c1 = a, cn = b. If the integrand f(x) has one or more removable discontinuities on [a,b], (ab f(x) dx = (ab g(x) dx, where g is f with its removable discontinuities removed. E.g., the improper Riemann integral (11 x/x dx is equal to the proper Riemann integral (11 1 dx = 2. Example: Evaluate (01 1/x dx. limt(0+ (t1 1/x dx = limt(0+ (ln 1 ln t) = limt(0+ ln 1/t = (, so (01 1/x dx diverges. Example: Evaluate (01 1/sqrt(x) dx. [Draw a picture.] limt(0+ (t1 x1/2 dx = limt(0+ 2x1/2 |t1 = limt(0+ 2(1)1/2 2t1/2 = 2, so (01 1/sqrt(x) dx = 2. Sometimes we can turn a type I improper integral into a type II improper integral, and vice versa, by exchanging the roles of x and y. (That is, we interpret the integral as the area of a region in the x,y plane, flip the region across the line y=x, and then calculate the area of the flipped region.) Example: (1( 1/x2 dx is the area of the region bounded between y=1/x2 and y=0 with x(1, which equals the area of the region bounded between x=1/y2 and x=0 with y(1 [draw picture], which equals the improper integral (01 (1/sqrt(x) 1) dx. Since ( (1/sqrt(x) 1) dx = ( (x1/2 1) dx = 2x1/2 x, we have (01 (1/sqrt(x) 1) dx = limt(0+ (2x1/2 x)(t1 = 1 0 = 1. (You can check this by evaluating the original type II improper integral directly: (1( 1/x2 dx = limt(( (1t x2 dx = limt(( x1(1t = limt(( 11t1 = 1.) Its tempting to write ((0 ex dx = ex((0 = e0 e( = 1 0 = 1, but this kind of shorthand can get you into trouble, so in this class, dont do it. Infinity is not a number! Important facts to remember: (1( (1/xp) dx is convergent if p>1 and divergent if p(1. (See p. 356 of Stewart.) [See if the students followed Stewart, or if they want me to go over his proof.) (0( p(x) ex dx is convergent for all polynomials p(x). (Use integration by parts, with help from LHospital, to prove this successively for p(x) = x, x2, x3, etc.) Question: Is (1( (1/x) ex dx convergent? (I chose this example because the integrand does not have an elementary antiderivative; you cant apply the Evaluation Theorem to get an exact answer.) Compare this improper integral with (1( ex dx:  Both integrals correspond to areas of regions, and the first region sits inside the second; and we know that the second region has finite area, so the first must too. This is an application of the Comparison Theorem for improper integrals, with f(x) = ex, g(x) = (1/x) ex, and a = 1. Comparison Theorem: Suppose that f and g are continuous functions with f(x) ( g(x) ( 0 for x ( a. (a) If (a( f(x) dx is convergent, then (a( g(x) dx is too. (b) If (a( g(x) dx is divergent, then (a( f(x) dx is too. Note: (a) and (b) are logically equivalent, but sometimes one uses (a) and sometimes one uses (b). One can also use the comparison method for improper integrals of type I. Example: Is (01 (1/(sin x)) dx convergent? Think about this for tomorrow.  NTWnorstu 2 3 F G H I M N O Q R i j m n o p  j x U ^ C D E F N O P Q X Y Z [ i j k l 𹵹 jhN hN6 hNCJ$hphFh;h)6h)h)H* h)6h)h)6H*h)h)6hgBh;hN6h)hhNh$2@ !HNT 2 Q R / L p q , - n '(d,gdNd,gdNl { | } ~ 7 8 9 : > ? 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