非齐次边值条件是什么意思
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非齐次边值条件是什么意思
非齐次边值条件是什么意思
非齐次边值条件是什么意思
非齐次就是有一次的,有二次的,甚至有三次的等等更高次的.
Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The books chronicle the adventures of the adolescent wizard Harry Potter and his best friends Ron Weasley ...
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Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The books chronicle the adventures of the adolescent wizard Harry Potter and his best friends Ron Weasley and Hermione Granger, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The main story arc concerns Harry's quest to overcome the evil dark wizard Lord Voldemort, whose aim is to subjugate non-magical people, conquer the wizarding world, and destroy all those who stand in his way, especially Harry Potter.
Since the 30 June 1997 release of the first novel Harry Potter and the Philosopher's Stone, the books have gained immense popularity, critical acclaim and commercial success worldwide.[2] The series has also had some share of criticism, including concern for the increasingly dark tone. As of June 2011[update], the book series has sold about 450 million copies and has been translated into 67 languages,[3][4] and the last four books consecutively set records as the fastest-selling books in history.
A series of many genres, including fantasy and coming of age (with elements of mystery, thriller, and romance), it has many cultural meanings and references.[5][6][7][8] According to Rowling, the main theme is death,[9] although it is primarily considered to be a work of children's literature. There are also many other themes in the series, such as love and prejudice.[10]赞同14
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