• 2022-06-09
    试证明下列问题:设 [tex=3.357x1.071]N9m+uQveFyIaAl7YOqTjMf+0L1vbyIMb/wQ2HJ3j7+k=[/tex] ,则对任给 [tex=11.857x1.357]ta7zBGUyNfONArS2crgHnstqfKZwwr0sh+VSg14q8euj7SgVl5J0Rnie5rpXlBI6[/tex]是开集.