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{{釋義}}

# [[仁義廉恥]]是也
# [[四維空間]]也，記曰<math>(x_1,x_2,x_3,x_4)</math>，其軸有四且等價，有互垂直平面<math>C_4^2=6</math>
# [[四維時空]]也，實三維空間加一維時間，記曰<math>(x_1,x_2,x_3,t)</math>.

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