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The Tresca Critrion is given in the form of non continuous equations:

Max(½|σ_{1}-σ_{2}|,½|σ_{2}-σ_{3}|,½|σ_{3}-σ_{1}|) = k

How did they come up with the invarient equation

f(J_{2},θ) = 2√J_{2}* sin(θ+⅓π)-2k, θ from (0 to 60)

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# Tresca criterion in terms of invariants

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