Equation 57 · Part 1 · Every Crystal Has Its Own Speed of Light
superscript
superscript
What this part means
A raised number can be a power. When it is a label or bound, it selects a case or the upper limit of a sum; the formula’s structure distinguishes these uses.
Its job in the formula
A raised mark can be a power or an index. Its position and the surrounding notation determine which.
Full expression→superscript→Article meaning
The passage around this formula
Put the two numbers next to each other and the crystal stops being a curiosity and becomes a calibration. The best emergent-Lorentz window any measured crystal can show is of order one percent: a first-order drift anisotropy is a ten-percent effect at a tenth of the cone speed, and even graphene’s own Fermi velocity drifts by a factor of three as the Dirac point is approached. Our own vacuum is not merely somewhat better than that. Stefano Liberati’s review of Lorentz-invariance tests gives the best measured bound on a rotationally invariant electron Lorentz-violation coefficient as roughly one part in 10^{16} [ 10 ] — fourteen orders of magnitude tighter than the best window any measured…
Learn the underlying idea
An exponent tells how a base is used in multiplication. In x³, x is the base and 3 is the exponent: x³ = x × x × x.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.