A nonintegrable function Consider the function defined on [0, 1] such that f ( x ) − 1 if x is a rational number and f ( x ) = 0 if x is irrational. This function has an infinite number of discontinuities, and the integral ∫ 0 1 f ( x ) d x does not exist. Show that the right, left, and midpoint Riemann sums on regular partitions with n subintervals equal 1 for all n . ( Hint: Between any two real numbers lie a rational and an irrational number.)
A nonintegrable function Consider the function defined on [0, 1] such that f ( x ) − 1 if x is a rational number and f ( x ) = 0 if x is irrational. This function has an infinite number of discontinuities, and the integral ∫ 0 1 f ( x ) d x does not exist. Show that the right, left, and midpoint Riemann sums on regular partitions with n subintervals equal 1 for all n . ( Hint: Between any two real numbers lie a rational and an irrational number.)
Solution Summary: The author shows the right, left and midpoint Riemann sums on regular partitions with n subintervals equal 1 for all.
A nonintegrable function Consider the function defined on [0, 1] such that f(x) − 1 if x is a rational number and f(x) = 0 if x is irrational. This function has an infinite number of discontinuities, and the integral
∫
0
1
f
(
x
)
d
x
does not exist. Show that the right, left, and midpoint Riemann sums on regular partitions with n subintervals equal 1 for all n. (Hint: Between any two real numbers lie a rational and an irrational number.)
A function is defined on the interval (-π/2,π/2) by this multipart rule:
if -π/2 < x < 0
f(x) =
a
if x=0
31-tan x
+31-cot x
if 0 < x < π/2
Here, a and b are constants. Find a and b so that the function f(x) is continuous at x=0.
a=
b= 3
Use the definition of continuity and the properties of limits to show that the function is continuous at the given number a.
f(x) = (x + 4x4) 5,
a = -1
lim f(x)
X--1
=
lim
x+4x
X--1
lim
X-1
4
x+4x
5
))"
5
))
by the power law
by the sum law
lim (x) + lim
X--1
4
4x
X-1
-(0,00+(
Find f(-1).
f(-1)=243
lim (x) +
-1 +4
35
4 ([
)
lim (x4)
5
x-1
Thus, by the definition of continuity, f is continuous at a = -1.
by the multiple constant law
by the direct substitution property
1. Compute
Lo
F⚫dr, where
and C is defined by
F(x, y) = (x² + y)i + (y − x)j
r(t) = (12t)i + (1 − 4t + 4t²)j
from the point (1, 1) to the origin.
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