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• How to express (-t^2 + x^2 + y^2 + z^2) as (x_μ)^2 ?

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• How to collect the derivatives in an expression for a scalar field
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• Plotting transition-of-transition fails with "cannot evaluate symbolic expression"

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• How to collect the derivatives in an expression for a scalar field

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• How to collect the derivatives in an expression for a scalar field

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• Plotting transition-of-transition fails with "cannot evaluate symbolic expression"
• How to express (-t^2 + x^2 + y^2 + z^2) as (x_μ)^2 ?