Timeline for Angles in an integral lattice
Current License: CC BY-SA 2.5
4 events
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| Feb 25, 2011 at 23:58 | comment | added | Gerhard Paseman | I don't remember what drugs I was taking when I wrote the comment above. Will Jagy is well on his way to convincing me that C/sqrt(k +C^2) is not in A_4 if k needs 4 squares for its sum. If so, then the sufficient condition above for a number to be in A_d may also be necessary. Gerhard "Flu Medicines Have Side Effects" Paseman, 2011.02.25 | |
| Feb 7, 2011 at 21:11 | history | edited | Gerhard Paseman | CC BY-SA 2.5 |
plea to WIll Jagy
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| Jan 25, 2011 at 19:13 | comment | added | Gerhard Paseman | For dimension 4, I have partial success. if C is odd and D is 2 or 3 mod 4, I can get it using a vector (1,0,0,0). I can get other C using (1,1,0,0) or (1,1,1,0) but I don't have a uniform construction. In any case, I see this as a number theoretic characterization, where for d = 2 D can only be 0,1,2,4 or 5 mod 8, and for d=3 D cannot be 7 mod 8. Gerhard "Ask Me About System Design" Paseman, 2011.01.25 | |
| Jan 25, 2011 at 9:30 | history | answered | Gerhard Paseman | CC BY-SA 2.5 |