ℒp space #
This file describes properties of almost everywhere strongly measurable functions with finite
p-seminorm, denoted by eLpNorm f p μ and defined for p:ℝ≥0∞ as 0 if p=0,
(∫ ‖f a‖^p ∂μ) ^ (1/p) for 0 < p < ∞ and essSup ‖f‖ μ for p=∞.
The Prop-valued Memℒp f p μ states that a function f : α → E has finite p-seminorm
and is almost everywhere strongly measurable.
Main definitions #
eLpNorm' f p μ:(∫ ‖f a‖^p ∂μ) ^ (1/p)forf : α → Fandp : ℝ, whereαis a measurable space andFis a normed group.eLpNormEssSup f μ: seminorm inℒ∞, equal to the essential supremumessSup ‖f‖ μ.eLpNorm f p μ: forp : ℝ≥0∞, seminorm inℒp, equal to0forp=0, toeLpNorm' f p μfor0 < p < ∞and toeLpNormEssSup f μforp = ∞.Memℒp f p μ: property that the functionfis almost everywhere strongly measurable and has finitep-seminorm for the measureμ(eLpNorm f p μ < ∞)
ℒp seminorm #
We define the ℒp seminorm, denoted by eLpNorm f p μ. For real p, it is given by an integral
formula (for which we use the notation eLpNorm' f p μ), and for p = ∞ it is the essential
supremum (for which we use the notation eLpNormEssSup f μ).
We also define a predicate Memℒp f p μ, requesting that a function is almost everywhere
measurable and has finite eLpNorm f p μ.
This paragraph is devoted to the basic properties of these definitions. It is constructed as
follows: for a given property, we prove it for eLpNorm' and eLpNormEssSup when it makes sense,
deduce it for eLpNorm, and translate it in terms of Memℒp.
(∫ ‖f a‖^q ∂μ) ^ (1/q), which is a seminorm on the space of measurable functions for which
this quantity is finite
Instances For
seminorm for ℒ∞, equal to the essential supremum of ‖f‖.
Equations
- MeasureTheory.eLpNormEssSup f μ = essSup (fun (x : α) => ‖f x‖ₑ) μ
Instances For
ℒp seminorm, equal to 0 for p=0, to (∫ ‖f a‖^p ∂μ) ^ (1/p) for 0 < p < ∞ and to
essSup ‖f‖ μ for p = ∞.
Equations
- MeasureTheory.eLpNorm f p μ = if p = 0 then 0 else if p = ⊤ then MeasureTheory.eLpNormEssSup f μ else MeasureTheory.eLpNorm' f p.toReal μ
Instances For
Alias of MeasureTheory.eLpNorm.
ℒp seminorm, equal to 0 for p=0, to (∫ ‖f a‖^p ∂μ) ^ (1/p) for 0 < p < ∞ and to
essSup ‖f‖ μ for p = ∞.
Equations
Instances For
Alias of MeasureTheory.eLpNorm_eq_eLpNorm'.
Alias of MeasureTheory.eLpNorm_nnreal_eq_eLpNorm'.
Alias of MeasureTheory.eLpNorm_exponent_top.
The property that f:α→E is ae strongly measurable and (∫ ‖f a‖^p ∂μ)^(1/p) is finite
if p < ∞, or essSup f < ∞ if p = ∞.
Equations
- MeasureTheory.Memℒp f p μ = (MeasureTheory.AEStronglyMeasurable f μ ∧ MeasureTheory.eLpNorm f p μ < ⊤)
Instances For
Alias of MeasureTheory.lintegral_rpow_nnnorm_eq_rpow_eLpNorm'.
Alias of MeasureTheory.Memℒp.eLpNorm_lt_top.
Alias of MeasureTheory.Memℒp.eLpNorm_ne_top.
Alias of MeasureTheory.lintegral_rpow_nnnorm_lt_top_of_eLpNorm'_lt_top.
Alias of MeasureTheory.lintegral_rpow_nnnorm_lt_top_of_eLpNorm_lt_top.
Alias of MeasureTheory.eLpNorm_lt_top_iff_lintegral_rpow_nnnorm_lt_top.
Alias of MeasureTheory.eLpNorm'_exponent_zero.
Alias of MeasureTheory.eLpNorm_exponent_zero.
Alias of MeasureTheory.eLpNorm'_zero.
Alias of MeasureTheory.eLpNorm'_zero'.
Alias of MeasureTheory.eLpNormEssSup_zero.
Alias of MeasureTheory.eLpNorm_zero.
Alias of MeasureTheory.eLpNorm_zero'.
Alias of MeasureTheory.eLpNorm'_measure_zero_of_exponent_zero.
Alias of MeasureTheory.eLpNormEssSup_measure_zero.
Alias of MeasureTheory.eLpNorm_measure_zero.
Alias of MeasureTheory.eLpNorm'_neg.
Alias of MeasureTheory.eLpNorm_neg.
Alias of MeasureTheory.eLpNorm'_const.
Alias of MeasureTheory.eLpNorm'_const'.
Alias of MeasureTheory.eLpNormEssSup_const.
Alias of MeasureTheory.eLpNorm'_const_of_isProbabilityMeasure.
Alias of MeasureTheory.eLpNorm_const.
Alias of MeasureTheory.eLpNorm_const'.
Alias of MeasureTheory.eLpNorm_const_lt_top_iff.
Alias of MeasureTheory.eLpNorm'_mono_nnnorm_ae.
Alias of MeasureTheory.eLpNorm'_mono_ae.
Alias of MeasureTheory.eLpNorm'_congr_nnnorm_ae.
Alias of MeasureTheory.eLpNorm'_congr_norm_ae.
Alias of MeasureTheory.eLpNorm'_congr_ae.
Alias of MeasureTheory.eLpNormEssSup_congr_ae.
Alias of MeasureTheory.eLpNorm_mono_nnnorm_ae.
Alias of MeasureTheory.eLpNorm_mono_ae.
Alias of MeasureTheory.eLpNorm_mono_ae_real.
Alias of MeasureTheory.eLpNorm_mono_nnnorm.
Alias of MeasureTheory.eLpNorm_mono.
Alias of MeasureTheory.eLpNorm_mono_real.
Alias of MeasureTheory.eLpNormEssSup_lt_top_of_ae_nnnorm_bound.
Alias of MeasureTheory.eLpNorm_le_of_ae_bound.
Alias of MeasureTheory.eLpNorm_congr_nnnorm_ae.
Alias of MeasureTheory.eLpNorm_congr_norm_ae.
Alias of MeasureTheory.eLpNorm'_norm.
Alias of MeasureTheory.eLpNorm_norm.
Alias of MeasureTheory.eLpNorm'_norm_rpow.
Alias of MeasureTheory.eLpNorm_norm_rpow.
Alias of MeasureTheory.eLpNorm_congr_ae.
Alias of MeasureTheory.Memℒp.of_le.
Alias of MeasureTheory.eLpNorm'_mono_measure.
Alias of MeasureTheory.eLpNormEssSup_mono_measure.
Alias of MeasureTheory.eLpNorm_mono_measure.
Alias of MeasureTheory.eLpNorm_indicator_eq_eLpNorm_restrict.
Alias of MeasureTheory.eLpNorm_indicator_eq_eLpNorm_restrict.
Alias of MeasureTheory.eLpNorm_restrict_le.
For a function f with support in s, the Lᵖ norms of f with respect to μ and
μ.restrict s are the same.
Alias of MeasureTheory.eLpNorm_restrict_eq_of_support_subset.
For a function f with support in s, the Lᵖ norms of f with respect to μ and
μ.restrict s are the same.
Alias of MeasureTheory.eLpNorm'_smul_measure.
Alias of MeasureTheory.eLpNormEssSup_smul_measure.
Use eLpNorm_smul_measure_of_ne_top instead.
See eLpNorm_smul_measure_of_ne_zero' for a version with scalar multiplication by ℝ≥0.
Alias of MeasureTheory.eLpNorm_smul_measure_of_ne_zero.
See eLpNorm_smul_measure_of_ne_zero' for a version with scalar multiplication by ℝ≥0.
See eLpNorm_smul_measure_of_ne_zero for a version with scalar multiplication by ℝ≥0∞.
See eLpNorm_smul_measure_of_ne_top' for a version with scalar multiplication by ℝ≥0.
See eLpNorm_smul_measure_of_ne_top' for a version with scalar multiplication by ℝ≥0∞.
Alias of MeasureTheory.eLpNorm_smul_measure_of_ne_top.
See eLpNorm_smul_measure_of_ne_top' for a version with scalar multiplication by ℝ≥0.
Alias of MeasureTheory.eLpNorm_one_smul_measure.
Alias of MeasureTheory.eLpNorm_one_add_measure.
Alias of MeasureTheory.eLpNorm'_eq_zero_iff.
Alias of MeasureTheory.eLpNormEssSup_eq_zero_iff.
Alias of MeasureTheory.eLpNorm_eq_zero_iff.
Alias of MeasureTheory.ae_le_eLpNormEssSup.
Alias of MeasureTheory.meas_eLpNormEssSup_lt.
Alias of MeasureTheory.eLpNormEssSup_piecewise.
Alias of MeasureTheory.eLpNorm_top_piecewise.
Alias of MeasureTheory.eLpNormEssSup_map_measure.
Alias of MeasureTheory.eLpNorm_map_measure.
Alias of MeasureTheory.AEEqFun.eLpNorm_compMeasurePreserving.
Alias of MeasurableEmbedding.eLpNorm_map_measure.
Alias of MeasureTheory.eLpNorm'_le_nnreal_smul_eLpNorm'_of_ae_le_mul.
Alias of MeasureTheory.eLpNormEssSup_le_nnreal_smul_eLpNormEssSup_of_ae_le_mul.
Alias of MeasureTheory.eLpNorm_le_nnreal_smul_eLpNorm_of_ae_le_mul.
When c is negative, ‖f x‖ ≤ c * ‖g x‖ is nonsense and forces both f and g to have an
eLpNorm of 0.
Alias of MeasureTheory.eLpNorm_eq_zero_and_zero_of_ae_le_mul_neg.
When c is negative, ‖f x‖ ≤ c * ‖g x‖ is nonsense and forces both f and g to have an
eLpNorm of 0.
Bounded actions by normed rings #
In this section we show inequalities on the norm.
Alias of MeasureTheory.eLpNorm'_const_smul_le.
Alias of MeasureTheory.eLpNorm_const_smul_le.
Bounded actions by normed division rings #
The inequalities in the previous section are now tight.
Alias of MeasureTheory.eLpNorm'_const_smul.
Alias of MeasureTheory.eLpNormEssSup_const_smul.
Alias of MeasureTheory.eLpNorm_const_smul.
Alias of MeasureTheory.le_eLpNorm_of_bddBelow.
Alias of MeasureTheory.le_eLpNorm_of_bddBelow.
Alias of MeasureTheory.le_eLpNorm_of_bddBelow.
Alias of MeasureTheory.ae_bdd_liminf_atTop_rpow_of_eLpNorm_bdd.
A continuous function with compact support belongs to L^∞.
See Continuous.memℒp_of_hasCompactSupport for a version for L^p.
A single function that is Memℒp f p μ is tight with respect to μ.
Alias of MeasureTheory.Memℒp.exists_eLpNorm_indicator_compl_lt.
A single function that is Memℒp f p μ is tight with respect to μ.