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71 - , 6 71, ? 71 {} - , dom (A) = dom (B ), 7Z . R 7 ?, R , 6a * -b (R),

6 * -b (R) = W: R,

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U - , ; V - ; dom - U D; R = {7Zi t ..., 7 Z p } - , TZi U, {1,2, ..., }; X = {xi, ... , } - , * G X - 7 i {1,2, ..., }; 0 - , ; - , , : ', , , , , ', , U, , 0. = (U, , dom , R, } 0, 0) .

, , , X , R ( 7 Z 쳺 - 1Z) , - . , , .

 
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