coincides with equation (9.28) as far as the terms
involving h
n
are concerned.
Now we express Δy in the form
Δy=ak
1
+bk
2
+ck
3
+dk
4
(9.29)
where
[]
1
21
2233
123
32
2
2
1221
3
322
32221
43
2
2
1221
3
32
3
(,)
(,)
66
(,)
(2)
2
(36)
6
,
(2)
2
(3
6
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khfxmhymk
mhmh
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