c b\ t t p
1
Pr e e B\

(
_
/ cfw_
.
,
7
wv
v
cfw_t 7
h
)
e
Av
.
C
9h
a
c
c

2
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
)

o
c
_
2
.
L
cl
i Me
N
u
t
.
Scanned by CamScanner
Scanned by CamScanner


n wb e
,
.
f f l uwm l
l
m
L M
m w
,
n
m4 w 0 l
L
:
A
r
ew
o B1w
O
cfw_
H
S r
t
v w
cfw_5
tr m
d
U
A46 t
W
tu
L
t e
.
A V e g
L
.
lcfw_
A
.
l
_
V9
_
Qlq
lw
>
J) 3
l
_
t
o m
P
W
L
A
y
iA
.
.
Scanned by CamScanner
0
m
,
.
.
C
D
.
i Mj

Y
bt L
v i(A
!
.
t
e
H
i \
c
+
(
DH
.
C=
b(
A
(
c
.
<
Scanned by CamScanner
jvr
1i
c
cfw_
<

.
m
IA
t
p
Pt 1
C
p kct r
w
,
(
cfw_>c
L I
t k
CA
C
b
he
l W
1
Scanned by CamScanner
_
1
/
L



e
Li
n
1
e
l

of
_
b
L
lm B
t
*
.
R
m
Math 261 Proofs and Fundamentals
Shuyi WENG
Spring 2012
Prof. Bloch
Homework Assignment  May 2, 2012
Exercise 5.3.1
(1) Relation M is an equivalence relation on R.
(2) Relation S is not an equivalenc
Math 261 Proofs and Fundamentals
Shuyi WENG
Spring 2012
Prof. Bloch
Homework Assignment  May 7, 2012
Exercise 6.3.1 (2)
Theorem. The following formula holds for all n N.
12 + 22 + + n2 =
n(n+1)(2n+1)