neilparker62's latest activity

or ##RL^2 = (2x)^2 - (2)^2 = 4x^2-4## We can also draw the other diagonal and apply Ptolemy directly: ##2x + 22x =...

@neilparker62 My solution with your diagram is simple. Let RL=red line. Then ## (RL)^2=2^2+4x^2-2(2)(2x) \cos{\theta} ## and ##...

Thanks - just once though! Since one triangle is right, Pythagoras will there suffice.

Very interesting. It reminded me of what my company did in the 80's. We needed to take an optical image of a fingerprint, compress it...

I apparently passed my 15 year PF anniversary earlier this year, but only noticed just now thanks to this post :biggrin: Anyway, I too...

Hey all. Looks like my 15 year anniversary of joining PF happened yesterday (while my internet was down). Just wanted to say thanks to...

Diophantus Book II Problem VIII. To divide a square (of a rational number) into two other squares - also of rational numbers. Let the...

I want to thank those members who interacted with me a couple of years ago in two Optics Forum threads. They were @Drakkith, @hutchphd...

Congrats! Probably includes blood pressure medication!

The Andromeda Galaxy (M31, NGC224), captured from my back patio, Nov-Dec., 2024. The Andromeda Galaxy is the closest galaxy* to our own...

All the best - can scarcely even imagine what it takes to be a PF admin!

@berkeman is the American counterpart to @fresh_42's German equanimity and efficiency.

LOL, is that what that is? I thought it was a paint roller, to symbolize the work to be done... :smile:

I am thrilled and honored to announce that @berkeman has accepted a role as PF Admin! @berkeman has 20 impactful years at PF under his...