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¿¼ÂÇ ¶¨ÒåΪ

(x) = .

µÄ ``º¯Êý'' : [,] -> [,]. ÎÊ µÄÐÔÖÊÈçºÎ?


·Öʽ

Éè : [,] -> [,] ÊÇÒ»¸öº¯Êý, ¶¨ÒåΪ

(x) = .

ÑéÖ¤ ÊÇË«ÉäµÄ, ²¢¼ÆËãÆäÄ溯Êý -1: [,] -> [,].

Äã¿ÉÒÔÓà sqrt(2) ±íʾ 2 µÄƽ·½¸ù.


Ä溯ÊýµÄÖµ

Éè : -> ÊÇÒ»¸öº¯Êý, ¶¨ÒåΪ

(x) = .

ÑéÖ¤ ÊÇË«ÉäµÄ, ËùÒÔÎÒÃÇÓÐÒ»¸öÄ溯Êý -1: -> . ¼ÆË㺯ÊýÖµ -1().

ÄãµÄ»Ø´ð±ØÐ뾫ȷµ½ 4 λÓÐЧÊý×Ö.


²»¿É΢Ä溯Êý

º¯Êý : -> ¶¨ÒåΪ

(x) = 

ËüÊÇË«ÉäµÄ, µ«´æÔÚÒ»¸öµã    ʹµÃÄ溯Êý -1(x) ÔÚ Éϲ»¿É΢. Çó .


¶þ´Îº¯Êý

Éè : [,] -> [,] ÊÇÒ»¸öº¯Êý, ¶¨ÒåΪ

(x) = .

ÑéÖ¤ ÊÇË«ÉäµÄ, ²¢¼ÆËãÄ溯Êý -1: [,] -> [,].

Äã¿ÉÒÔÓà sqrt(2) ±íʾ 2 µÄƽ·½¸ù.


Ä溯ÊýµÄµ¼Êý

Éè : -> ÊÇÒ»¸öº¯Êý, ¶¨ÒåΪ

(x) = .

ÑéÖ¤ ÊÇË«ÉäµÄ, ËùÒÔÎÒÃÇÓÐÒ»¸öÄ溯Êý (x) = -1(x). ¼ÆËãµ¼ÊýÖµ  '() .

ÄãµÄ»Ø´ð±ØÐ뾫ȷµ½ 4 λÓÐЧÊý×Ö.

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