[talanum1 (OP)]

You would have to detect space points -  not possible by today's technology.

Actually it is detectable by a camera: I don't know why.

[Bored chemist]

You would have to detect space points -  not possible by today's technology.

because they don't exist.

[talanum1 (OP)]

Spacetime exists by General Relativity. Therefore space and time exists. Therefore space exist (by And-elimination).

[evan_au]

Actually (dark bands behind the double slit) is detectable by a camera: I don't know why.

I can tell you why: If you shift the phase of a wave by 180, it will cancel with the wave that hasn't been shifted.
- These are boht waves, from the same source
-  There is no need for anti-waves
- This also happens for ocean waves and sound waves in air and guitar strings. They don't need anti-oceans or anti-air or anti-guitars to produce phase shifts or cancellation.

https://en.wikipedia.org/wiki/Double-slit_experiment

[hamdani yusuf]

I can tell you why: If you shift the phase of a wave by 180, it will cancel with the wave that hasn't been shifted.
- These are boht waves, from the same source

With radio transmitters, destructive interference can be produced reliably from two independent sources.

[evan_au]

destructive interference can be produced reliably from two independent sources

I agree, if the two sources are frequency-locked. But if they are frequency-locked, they are no longer independent.

If the two sources are on different frequencies, they don't produce fixed patterns of destructive and constructive interference.

That's why the double-slit experiment is so useful - you don't need two frequency-locked sources; you produce two sources (slits) from a single source, so it is automatically frequency-locked.

[Bored chemist]

Spacetime exists by General Relativity. Therefore space and time exists. Therefore space exist (by And-elimination).

Did you think that was relevant?
Had anyone said spacetime didn't exist?