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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Manifold <strong>Geom</strong>etry 3912 − cell : x 0 •f∨ h❘ • x 1 h : f ≃ g ∈ M,✒gh : [0, 1] × [0, 1] → M, h : f ↦→ g, g = h(f(x 0 )),h(x 0 , 0) = f(x 0 ), h(x 0 , 1) = g(x 0 ), h(0, t) = x 0 , h(1, t) = x 1e.g., linear homotopy: h(x 0 , t) = (1 − t) f(x 0 ) + t g(x 0 );e.g., homotopy between two Euler–Lagrangian (f, g) − dynamicswith the same endpoint conditions (x 0 , x 1 ) :ddt f ẋ i = f x i, and ddt g ẋ i = g x i with x(0) = x 0, x(1) = x 1 ;3 − cell : x 0 •hfj> gi❘• x 1 j : h ≃ i ∈ M,✒j : [0, 1] × [0, 1] × [0, 1] → M, j : h ↦→ i, i = j(h(f(x 0 )))j(x 0 , t, 0) = h(f(x 0 )), j(x 0 , t, 1) = i(f(x 0 )),j(x 0 , 0, s) = f(x 0 ), j(x 0 , 1, s) = g(x 0 ),j(0, t, s) = x 0 , j(1, t, s) = x 1e.g., linear composite homotopy: j(x 0 , t, s) = (1 − t) h(f(x 0 )) + t i(f(x 0 ));or, homotopy between two homotopies between above two Euler-Lagrangian (f, g) − dynamics with the same endpoint conditions (x 0 , x 1 ).or3.13.4.3 Lie–Hamiltonian Biodynamical FunctorThe three fundamental and interrelated obstacles facing any researcher inthe field of human–like musculo–skeletal dynamics, could be identified as[<strong>Ivancevic</strong> and Snoswell (2001)]:(1) Deterministic chaos,(2) Stochastic forces, and(3) Imprecision of measurement (or estimation) of the system numbers(SN): inputs, parameters and initial conditions.

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