Zulip Chat Archive
Stream: Is there code for X?
Topic: measure_theory.integrable uncurry f
rtertr (Sonia) (Jun 13 2023 at 09:32):
Hello, I am trying to use the theorem measure_theory.integral_integral_swap .
My function is (f : ℝ → ℝ → ℂ)
. I have to prove measure_theory.integrable (function.uncurry f) (measure_theory.measure_space.volume.prod measure_theory.measure_space.volume)
.
What conditions should I put on f
and what relevant theorems are there to transform this statement? :)
Kind regards,
Moritz Doll (Jun 13 2023 at 09:43):
this is really hard to answer without any information about f
. The question you should answer first is 'what is the pen&paper proof?'. nevertheless I would think that docs#measure_theory.integrable_prod_iff or the primed version could be helpful
rtertr (Sonia) (Jun 13 2023 at 10:04):
Okay, thank you! I will try! I think the function might just be infinitely continuously differentiable :)
rtertr (Sonia) (Jun 13 2023 at 14:37):
Hello again,
Was able to prove most things I wanted, but I need to prove continuous (function.uncurry f)
, and I was wondering if there could be a version of continuous_uncurry_of_discrete_topology where α does not have to a discrete_topology? :)
Kind regarrds,
Moritz Doll (Jun 13 2023 at 14:50):
there is docs#continuous_map.continuous_uncurry_of_continuous
Last updated: Dec 20 2023 at 11:08 UTC