Chapter 7 linear equaTionS 209
- H kAtt
L
t
H kAtt
L
HL kAtt
HL kAt
= −
= −
=−
=
();
()
()
(^121)
12
12
1 −−
++
+=
- =
kAt
kAtkAt
HL kAtkAt
HL kAt
kA
kAt
kA
HL
2
22
21
21
kkAt
kA
(^2) =t 1
- Landn
Land
Land d
aa
Land d
dd
=+−
=+−
=+ −
−−
−= −
++
();
()
1
1
LLadnd
Lad
d
nd
d
Lad
d
n
−+=
−+=
−+=
- S rL a
r
r
S rL a
r
rSrL a
rS SrLa
rL rL
= −
−
= −
−
−=−
−=−
−−
1
1
1
;
()
rrS rL Sa
SS
rS rL Sa
rSLSa
rS L
SL
S
−−=−
++
−=−
−=−
−
−
=
()
()
()
−−
−
= −
−
a
SL
r Sa
SL