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4 - % 4 & : B

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4 2

1 3

1

Π EIπ Pπ

0 α 0

α 4l 4l

 

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p

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ε

y

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a b b b

x x y y xy xy _{x a x a}

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1

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2 −−−− −−−− −−−− ==== −−−− =−=−=−=−

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=

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1

Π αε 2αυε ε αε βγ dxdy u dy u dy

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2 2

a b b

1

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= + + −

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