Equation 6 · Part 2 · The Bend an Elevator Cannot Fake

Symbol x

U(\mathbf x) := d\tau/dt

x

What this part means

x is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.

Its job in the formula

x is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.

Full expressionSymbol xArticle meaning

The passage around this formula

For a static observer at position $\mathbf x$ in a stationary spacetime, define U( $\mathbf x$ ) := d $\tau$ /dt , the local rate of proper time relative to coordinate time. Two clocks compared through any phase-coherent link that depends only on their respective proper frequencies report the ratio $\nu_j$ / $\nu_i$ = U( $\mathbf x_j$ )/U( $\mathbf x_i$ ) — a…

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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.

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