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Equation 36 · Part 1 · The Bend an Elevator Cannot Fake

Symbol phi_rm true

ϕtrue\phi_{\rm true}
ϕtrue\phi_{\rm true}

What this part means

phiri_rm true is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

phiri_rm true is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

Weighted least squares achieves zero residual on any data that lie exactly in the range of B . If y truly equals Bϕtrue\phi_{\rm true} for some vector ϕtrue\phi_{\rm true} — meaning a genuine, single-valued scalar potential sits at every node, however violently curved the spacetime that produced it — then ϕtrue\phi_{\rm true} itself drives the weighted sum of squares to exactly zero, which is the smallest value the nonnegative objective can take, so the…

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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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