A new kind of spline geometric method approach is presented. Its main ingredient is the use of well established spline spaces forming a discrete de Rham complex to construct a primal sequence $\{X^k_h\}^n_{k=0}$, starting from splines of degree $p$, and a dual sequence $\{\tilde{X}^k_h\}_{k=0}^n$, starting from splines of degree $p-1$. By imposing homogeneous boundary conditions to the spaces of the primal sequence, the two sequences can be isomorphically mapped into one another. Within this setup, many familiar second order partial differential equations can be finally accommodated by explicitly constructing appropriate discrete versions of constitutive relations, called Hodge--star operators. Several alternatives based on both global and local projection operators between spline spaces will be proposed. The appeal of the approach with respect to similar published methods is twofold: firstly, it exhibits high order convergence. Secondly, it does not rely on the geometric realization of any (topologically) dual mesh. Several numerical examples in various space dimensions will be employed to validate the central ideas of the proposed approach and compare its features with the standard Galerkin approach in Isogeometric Analysis.
Adaptively-refinable polar-spline discrete differential forms: hierarchical construction, exactness, and applications
Delft Institute of Applied Mathematics, Delft University of Technology（代尔夫特应用数学研究所，代尔夫特理工大学）；Department of Applied Mathematics, University of Santiago de Compostela（圣地亚哥德孔波斯特拉大学应用数学系）；Galician Centre for Mathematical Research and Technology (CITMAga), University of Santiago de Compostela（圣地亚哥德孔波斯特拉大学加利西亚数学研究与技术研究中心）
Weakening the tight coupling between geometry and simulation in isogeometric analysis: from sub- and super- geometric analysis to Geometry Independent Field approximaTion (GIFT)
University of Chile（智利大学）；Hangzhou Dianzi University（杭州电子科技大学）；Institute of Computational Engineering, University of Luxembourg（卢森堡大学计算工程研究所）；School of Engineering, Cardiff University（卡迪夫大学工程学院）
Adaptive isogeometric analysis with hierarchical box splines
Istituto Nazionale di Alta Matematica, Unità di Ricerca di Firenze c/o DiMaI “U. Dini”, Università di Firenze（意大利高等数学研究所佛罗伦萨研究单元）；Dipartimento di Matematica e Informatica “U. Dini”, Università degli Studi di Firenze（佛罗伦萨大学数学与信息学系）；Dipartimento di Matematica, Università degli Studi di Roma “Tor Vergata”（罗马托维加塔大学数学系）
Polynomial spline spaces of non-uniform bi-degree on T-meshes: Combinatorial bounds on the dimension
Institute for Computational Engineering and Sciences, University of Texas at Austin（德克萨斯大学奥斯汀分校计算工程与科学研究所）；Université Côte d’Azur, Inria Sophia Antipolis Méditerranée（蔚蓝海岸大学，法国国家信息与自动化研究所索菲亚安提贝斯分部）
