May
23
comment How do you calculate the magnitude of the light waves emitted from an LED?
If not interferometer, at least distance approximation using the inverse square law
May
23
comment How do you calculate the magnitude of the light waves emitted from an LED?
basic op amp voltage amplifier
May
23
asked How do you calculate the magnitude of the light waves emitted from an LED?
May
23
comment Integrating over the naturals. What does it mean?
What does it mean though, if you don't mind that type of question?
May
23
accepted Integrating over the naturals. What does it mean?
May
23
awarded Socratic
May
23
asked Integrating over the naturals. What does it mean?
May
22
accepted How to make a topology out of $N$ that involves convergent / divergent sets.
May
22
comment How to make a topology out of $N$ that involves convergent / divergent sets.
Okay, so all open sets in the topology are divergent but not all divergent sets are open.
May
22
comment How to make a topology out of $N$ that involves convergent / divergent sets.
Okay, so $B$ is a divergent set yet not open.
May
22
comment How to make a topology out of $N$ that involves convergent / divergent sets.
Okay, so you exhibited two sets that are neither open nor closed?
May
22
comment How to make a topology out of $N$ that involves convergent / divergent sets.
I'm not sure what you mean, do you mean their complements are not closed?
May
22
asked How to make a topology out of $N$ that involves convergent / divergent sets.
May
21
revised Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
added 92 characters in body
May
21
comment Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
Keeping this up since I put a lot of writing into it and it got starred. But it has an error which I will indicate in the post.
May
20
comment Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
@jgon fixed that. I use now closed sets and their pre-images being closed to prove continuity.
May
20
revised Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
added 382 characters in body; edited tags
May
20
revised Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
added 84 characters in body
May
20
comment Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
@jgon not so in this situation because I added "Now if arithmetic sequence length were bounded then we'd certainly have that this is so..." and the set $A$ of interest is such a set.
May
20
revised Elemenatry topological proof of Erdos conjecture on Arithmetic Sequences
added 377 characters in body
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