On the crossing of extremals at focal points
نویسندگان
چکیده
منابع مشابه
On the Crossing of Extremals at Focal Points
PROOF. Call the set of points KC.A a t which the Jacobian of T vanishes critical points, then I assert that if the counter image T~by b£:B, is infinite, it contains a critical point. In fact if ¥ are the coordinates of such a point b, there is a convergent sequence of points of T~b with coordinates a\ approaching a point ao from a definite direction, as is expressed by the following set of equa...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1943
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1943-07960-8