In the following exercises, evaluate the iterated integrals by choosing the order of integration . 23. ∫ 1 e ∫ 1 e [ 1 x sin ( ln x ) + 1 y cos ( ln y ) ] d x d y
In the following exercises, evaluate the iterated integrals by choosing the order of integration . 23. ∫ 1 e ∫ 1 e [ 1 x sin ( ln x ) + 1 y cos ( ln y ) ] d x d y
In the following exercises, evaluate the iterated integrals by choosing the order of integration.
23.
∫
1
e
∫
1
e
[
1
x
sin
(
ln
x
)
+
1
y
cos
(
ln
y
)
]
d
x
d
y
With differentiation, one of the major concepts of calculus. Integration involves the calculation of an integral, which is useful to find many quantities such as areas, volumes, and displacement.
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p-1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
2
p-1
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
23
The set T is the subset of these residues exceeding
2°
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
how come?
Shading a Venn diagram with 3 sets: Unions, intersections, and...
The Venn diagram shows sets A, B, C, and the universal set U.
Shade (CUA)' n B on the Venn diagram.
U
Explanation
Check
A-
B
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3. A different 7-Eleven has a bank of slurpee fountain heads. Their available flavors are as follows: Mountain
Dew, Mountain Dew Code Red, Grape, Pepsi and Mountain Dew Livewire. You fill five different cups full
with each type of flavor. How many different ways can you arrange the cups in a line if exactly two Mountain
Dew flavors are next to each other?
3.2.1
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