Equation 40 · Part 1 · The Bend an Elevator Cannot Fake
Symbol phi
What this part means
phi 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
phi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol phi→Article meaning
The passage around this formula
…itself drives the weighted sum of squares to exactly zero, which is the smallest value the nonnegative objective can take, so the fitted values equal y exactly and r 0 . This holds independent of how strongly varies from node to node, independent of C , and independent of the graph’s shape, because it is a fact about linear regression, not about gravity: any closed loop of static clocks, in any static spacetime whatsoever, closes exactly, because a sum of consecutive differences of a single-valued…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
Open the illustrated variables: a letter stands for a value guide →
See this notation across published equations →
The article lists its research sources here.