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_img http://marty.alain.free.fr/pFwiki/data/tears_20111211.jpg _h1 thin shells {{hide} {def code_block pre {@ style="text-align:center; font:normal 1.5em optima; line-height:1.5em; background:#eee; padding:5px;"}} } _h3 1) equililibrium equations of an elastic medium in S{sup 3} {{code_block} ∇{sub j}n{sup ij} + F{sup i} = 0 i,j ∈ [1,2,3] ;;n{sub k}n{sub 0}{sup ik} + F{sub 0}{sup i} = 0 boundary conditions } _p This system with 3 equations and 6 unknowns (n{sup ij} is symetric) is hyperstatic. _h3 2) equilibrium equations for thin shells {{code_block} ∇{sub j}N{sup ij} + F{sup i} = 0 ω{sub ij}N{sup ij} - P = 0 i,j ∈ [1,2] } _p This system, with 3 equations and 3 unknowns, (N{sup ij} is symetric) is isostatic. _h3 3) source _ul coques minces|http://marty.alain.free.fr/recherche/articles/coques.pdf _ul pforms|http://lambdaway.free.fr/lambdawalks/?view=pforms _ul pFbook|http://marty.alain.free.fr/recherche/pformes/pFbook.pdf _ul pFbook_HTML|http://lambdaway.free.fr/workshop/data/pFbook_HTML/ _ul pfBook_PDF|http://lambdaway.free.fr/lambdaspeech/data/pFbook.pdf (PDF 6.8Mb) _ul straightaway|http://lambdaway.free.fr/lambdaspeech/data/straightaway.pdf (PDF 5Mb) _ul formes immergées|http://lambdaway.free.fr/workshop/?view=SVG_3D _ul pascalian forms|http://lambdaway.free.fr/workshop/?view=pforms _img http://marty.alain.free.fr/confs/data/angles/2/pFbook/images/323.6.jpg