As mentioned at <Plancherel theorem>{full}, some people call this part of <Plancherel theorem>, while others say it is just a corollary.

This is an important fact in <quantum mechanics>, since it is because of this that it makes sense to talk about <position and momentum space> as two dual representations of the <wave function> that contain the exact same amount of information.

The Fourier transform is a bijection in $L^2$

The Fourier transform is a bijection in L2

The Fourier transform is a bijection in L^2

But only for the proper Riemann integral: https://math.stackexchange.com/questions/2293902/functions-that-are-riemann-integrable-but-not-lebesgue-integrable


Every Riemann integrable function is Lebesgue integrable

{wiki}

= Piezo
{synonym}

= Piezoelectric
{synonym}


Piezoelectric motor

Light

https://physics.stackexchange.com/questions/73942/how-do-we-know-photons-have-spin-1

Original 1931 experiment by Raman and Bhagavantam: http://dspace.rri.res.in/bitstream/2289/2123/1/1931%20IJP%20V6%20p353.pdf


Photon spin

Radiation pressure

{tag=Squeezed coherent state}
{wiki=Squeezed states of light}

A <squeezed coherent state> of <light>.

Squeezed state of light

{tag=Light}
{wiki}

The <science> and engineering of <light>!

When dealing more specifically with individual <photons>, we usually call it <photonics>.

Optics

Narcissism

Personality type

{wiki}

Can produce two <quantum entanglement>[entangled] particles.

Particle decay

Described for example in <quantum field theory lecture by tobias osborne 2017/lecture 1>.

Relativistic particle in a box thought experiment

Hemoglobin

{wiki}

From <Wikipedia>:
> In <humans>, myoglobin is only found in the bloodstream after muscle injury.

Myoglobin

{c}
{tag=Star system}
{title2=0.01 m}
{wiki}


Alpha Centauri

{c}
{tag=Star system}
{title2=9 ly}
{title2=-1.5 m}
{wiki}

This is quite close! But as mentioned at: <stars nearest to the Sun>, there are several others nearby. Notably <Sirius> at 9 <ly>, the brightest star in the sky as of 2020.

Ciro Santilli @cirosantilli  40