k M
k M t
P t
e
P
dP k b t dt
P
b
P kt t C
P P C P
xx t
xx t
dx dt
x t C C
xx t
xx t
xx t
xx t
x
x t x
x t dx dt
x
xx t
x
xsemi-stable xt
xt
dx dt
x
t C
x
C
xsemi-stable xt
xt
dx dt
x
t C
x
C
x x x x x
x t x
x t
x x x x
x
x t x
x t
xx t
dx dt
x
t C
x
xx t
dx dt
x
t C
x
x x
x x
x x
x x
x x x
x x h x x h
x x s x x s
k a akx x a x x x a x x
c a
k a ax a x a
kx x a x x x
xx a k cc k
x
k c x x
t
x t x e xk a
h kM
h
x kx M x hx kx M x
k
dx k dt
N x x H
x H
dx dx
N x x H N H N x x H N H x N
H x N x t N t
x H N H t
h kM
x k x a b
a x
a b bkt
x t b
x t
v t
v k v v v