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How would go about arguing that the Stress-Energy tensor is actually a tensor based on how it must be linear in both it's arguments?

I'm thinking it requires one 1-form to select the component of 4-momentum (e.g. [tex] \vec{E}=<\tilda{dt} ,\vec{P}> ) [/tex] and also one 1-form to define the surface (e.g [tex] \tilda{dt} [/tex] defining surfaces of constant t, so giving us densities etc).

I know that [tex] T^{\alpha \beta}=T(\tilda{dx^{\alpha}}, \tilda{dx^{\beta}}) [/tex]. Not sure how one would argue that it therefore must be linear in these arguments?