1549301742-The_Theory_of_Difference_Schemes__Samarskii

(jair2018) #1
Econornical factorized sche1nes 589

to hold with constants c 1
manipulations:


. + 2jt, when providing current



p p

(^1) = 2= 2=


p [ p p l

= μ a~l (~~)


2
+ (,,\ + μ) (} a~l ~~ ~= + (l - (}) a~l ~~ ~:.

Indeed, accepting here (} = 1, we find that c 1 = jt, since
p
1 = 2= (ka1J(,,~13)

p
> jl 2= 1~a1^2.
e>= 1
For (} = 0 we are led to c 2 = >. + 2 μ by virtue of the relations
p p
1=μ 2= 1~a1^2 +(>.+μ) 2= ~~~~
a,s=l

p 1' p
= μ 2= 1~a1^2 + (>. + μ) 2= (2:: (~~)
2
)
a=l u=l s=l
p
= (.>. + 21-t) 2= 1~u1^2.
ex= l

Thus, c 1 = p and c 2 = >. + 2jt. The same operator R will be adopted as a
regularizer in the further development:


Ra y = -(J' y,,. ,,, a:...., ~ a:.
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