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The Bonnesen isoperimetric inequality in a surface of constant curvature 被引量:18
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作者 ZENG ChunNa MA Lei +1 位作者 ZHOU JiaZu CHEN FangWeit 《Science China Mathematics》 SCIE 2012年第9期1913-1919,共7页
We first estimate the containment measure of a convex domain to contain in another in a surface X of constant curvature.Then we obtain the analogue of the known Bonnesen isoperimetric inequality for convex domain in X... We first estimate the containment measure of a convex domain to contain in another in a surface X of constant curvature.Then we obtain the analogue of the known Bonnesen isoperimetric inequality for convex domain in X.Finally we strengthen the known Bonnesen isoperimetric inequality. 展开更多
关键词 hyperbolic plane projective plane kinematic formula Bonnesen isoperimetric inequality isoperi-metric deficit convex domain
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On the L_p-Dual Mixed Volumes
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作者 Lian Ying CHEN Chang Jian ZHAO 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2013年第9期1647-1654,共8页
We establish the cyclic inequality for i-th L p-dual mixed volume and Lp-dual Urysohn inequality between p-mean width and Lp-dual quermassintegral. Moreover, the dual isoperimetric inequality for Lp-dual mixed volume ... We establish the cyclic inequality for i-th L p-dual mixed volume and Lp-dual Urysohn inequality between p-mean width and Lp-dual quermassintegral. Moreover, the dual isoperimetric inequality for Lp-dual mixed volume is proved, which is an extension of the classical dual isoperimetric inequality. 展开更多
关键词 Dual mixed volume Lp-dual mixed volume mean width Lp-mean width dual isoperi-metric inequality Lp-dual quermassintegral
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两平面凸域的对称混合等周不等式 被引量:19
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作者 曾春娜 周家足 岳双珊 《数学学报(中文版)》 SCIE CSCD 北大核心 2012年第2期355-362,共8页
设K_k(k=i,j)为欧氏平面R^2中面积为A_k,周长为P_k的域,它们的对称混合等周亏格(symmetric mixed isoperimetric deficit)为σ(K_i,K_j)=P_i^2P_j^2-16π~2A_iA_j.根据周家足,任德麟(2010)和Zhou,Yue(2009)中的思想,用积分几何方法,得... 设K_k(k=i,j)为欧氏平面R^2中面积为A_k,周长为P_k的域,它们的对称混合等周亏格(symmetric mixed isoperimetric deficit)为σ(K_i,K_j)=P_i^2P_j^2-16π~2A_iA_j.根据周家足,任德麟(2010)和Zhou,Yue(2009)中的思想,用积分几何方法,得到了两平面凸域的Bonnesen型对称混合不等式及对称混合等周不等式,给出了两域的对称混合等周亏格的一个上界估计.还得到了两平面凸域的离散Bonnesen型对称混合不等式及两凸域的对称混合等周亏格的一个上界估计,并应用这些对称混合(等周)不等式估计第二类完全椭圆积分. 展开更多
关键词 对称混合等周亏格 对称混合等周不等式 Bonnesen型对称混合不等式
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