We revisit the classical extremal problem on Cartan domains. We first establish theorems for the extremal problem between Cartan domain and the unit ball.

研究了Cartan域上的极值问题。建立Cartan域的单位球之间极值问题的一个定理并给出它的一个应用。

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The initial investigation indicates an air-conditioning unit crashed through the ceiling and sent air rushing in, creating a ball of fire.

初步的报告显示一台空调装置撞穿了天花板令空气涌入，造成一个火球。

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Certain corrective actions of this guide may not be feasible with the Compact Ball Valve (sealed unit).

对于紧凑型球阀(密封装置)，本指南的某些纠正措施可能并不可行。

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For example, the NFL moved kickoffs from the 30-yard line to the 35 beginning in 2011, and also required the coverage unit to start within 5 yards of the ball, closing the distance between the teams.

FORBES: NFL's Elimination of Kick-Offs: Selfless Concern or Self-Preservation

Using the Sokka unit basically involves kicking a ball against a flat playing surface containing a number of electronic sensors that monitor accuracy and technique.

BBC: Kevin Keegan launches football training systems