The one-sided pressure-gradient boundary in its three consumed shapes #
The small-data theorem thm:A of paper/ckn.tex uses the one-sided
pressure-gradient estimate of prop:bootstrap in three different spellings.
The estimate itself is recorded by oneSidedPressureGradientQuantitative,
whose majorant is the explicit formula oneSidedPressureGradientKP. The
small-data statement instead asks only for some finite majorant, uniformly
in the velocity exponent τ ∈ [25/3, 25] and in the two radii. The uniform
bootstrap round and the closed half-cylinder estimate ask for the two
numerical instantiations (τ, R₀, R₁) = (25/3, 11/16, 43/64) and
(25, 5/8, 19/32), with the solution fields explicit, the hypotheses in the
order hsol → hdom → hsmall → hU → hD, and the measurability carrier written
as spaceTimeSet (vec3Ball 0 R₁) I.
The three theorems below are the translations between those spellings. The
exponent normalizations are exact: at τ = 25/3 the Morrey exponent
min ((1/τ + 8/25)⁻¹) q equals 25/11, because 25/11 < 5/2 < q, while at
τ = 25 it equals min q (25/9) and the minimum genuinely survives, since
q is only known to exceed 5/2 = 22.5/9. Nothing in this translation is
special to either numerical instantiation: the majorant formula, its
finiteness, and the estimate are all uniform in τ.
The hypothesis named hGA throughout the assembly of thm:A is
lem:pressure-gradient-morrey. These theorems only rewrite it between
spellings: existential majorant against explicit majorant, free centre
against origin carrier, and the two orders in which the solution hypotheses
are presented. No estimate is strengthened or weakened here.
The explicit majorant of prop:bootstrap witnesses the existential
majorant that the small-data statement asks for, at every admissible velocity
exponent and radius pair. No numerical instantiation is involved.
The existential form at (τ, R₀, R₁) = (25/3, 11/16, 43/64), in the exact
shape the uniform bootstrap round consumes: explicit solution fields, the
hypothesis order hsol → hdom → hsmall → hU → hD, the measurability carrier
written as a space-time set, and the Morrey exponent already normalized to
25/11.
The existential form at (τ, R₀, R₁) = (25, 5/8, 19/32), in the exact
shape the closed half-cylinder estimate consumes. Here the Morrey exponent
stays a minimum: q is only known to exceed 5/2, so min q (25/9) cannot
be simplified further.