For the following exercises, express the surface integral as an iterated double integral by using a projection on S on the x z -plane 311. Evaluate surface integral ∬ S ( x 2 z + y 2 ) d S , where S is hemisphere x 2 + y 2 + z 2 = a 2 , z ≥ 0 .
For the following exercises, express the surface integral as an iterated double integral by using a projection on S on the x z -plane 311. Evaluate surface integral ∬ S ( x 2 z + y 2 ) d S , where S is hemisphere x 2 + y 2 + z 2 = a 2 , z ≥ 0 .
For the following exercises, express the surface integral as an iterated double integral by using a projection on
S
on the
x
z
-plane
311. Evaluate surface integral
∬
S
(
x
2
z
+
y
2
)
d
S
, where
S
is hemisphere
x
2
+
y
2
+
z
2
=
a
2
,
z
≥
0
.
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, ...,
p-1
2
-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).
23
32
how come?
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
The set T is the subset of these residues exceeding
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
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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田
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