Other forms are similar to prove.

[Prove up].

Theorem 8.7 Assume ( A , A )and( B , B )DF( U ), then the necessary and sufficient condition for ( A , A )( B , B )is( A α , A α )( B α , B α )( ( α , α )[ 0,1 ]×[ , ] ) or ( A α ˙ , A α ˙ )( B α ˙ , B α ˙ )( ( α , α )[ 0,1 ]×[ , ] )or( A α , A α )( B α , B α )(( α , α ) R0, where R0 is the rational point set in [0, 1]).

Proof: Obvious necessity.

If ( A α , A α )( B α , B α )( ( α , α )[ 0,1 ]×[ , ] ), according ...

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