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[minor] [anisotropic_elasticity_47] beautify with more unicode #3

Open pressureless opened 3 years ago

pressureless commented 3 years ago

Create by @alecjacobson :

If we address pressureless/linear_algebra#72, pressureless/linear_algebra#71, and pressureless/linear_algebra#48 we could make this example much easier to read as I❤️LA:

from linearalgebra: tr

J₃ = 1₃,₃
κ_angle(Dₘ) = 3(√2 v)^⅔ (7/4‖Dₘ‖_F² - ¼tr(J₃DₘᵀDₘ))⁻¹

where

Dₘ ∈ ℝ^(3×3)  
v ∈ ℝ