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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
- Plot spines show in middle of graph

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- How to express (-t^2 + x^2 + y^2 + z^2) as (x_μ)^2 ?
- How to collect the derivatives in an expression for a scalar field

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