On the number of closed solutions to an equation ẋ = f(t, x), where fxn(t, x) ⩾ 0 (n = 1, 2, or 3)
نویسندگان
چکیده
منابع مشابه
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ژورنال
عنوان ژورنال: Journal of Mathematical Analysis and Applications
سال: 1991
ISSN: 0022-247X
DOI: 10.1016/0022-247x(91)90225-o