Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options answers only not deleted user 121665
12 votes
Accepted

An $L^1$ function but (really) no better?

There is a much more general result of Vallée-Poussin from which a negative answer to your question follows. Let $(X,\mu)$ be a measure space. We say that a family of function $\mathcal{F}\subset L^1( …
Piotr Hajlasz's user avatar