Define a map by
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Note that the frame
field induces local coordinates around any point on , and
the differential can be expressed as
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under such local coordinates. Thus is an
isomorphism when , which implies that is an immersion.
Furthermore, for
,
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Hence
is an embedding.
Note that the -action on preserves , and is a product action on , i.e. there are -actions on and
such that for any , , and . Under the identification map (1),
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Thus
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for any and . Since the -action preserves
and , are special lagrangian
submanifolds. By the uniqueness of ,
. Hence
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i.e. is a -equivariant
map.
We denote
the natural projection, and . Since the -action on preserves the metric and , is invariant. By , . Then is a -equivariant special lagrangian fibration of of phase . We obtain the conclusion.
∎