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( ) =

+ ( ), ,

, > ,

( ) =

+

+ , < ,

+ , ,

(

) =

[

]

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:R

R

( ) =

< ,

+

, > .

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, : R \ { } ( ) > ( ) > ( , + ) ( ) > ( ) , : R R

=

: R R

(

) =

,

= ,

, =

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,

: R R

={ R; ( )= ( )} >

( , + ) =

Z

( , + )