Timeline for $\lambda$-ring endomorphisms of ${\mathbb Z}[x]$
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 1, 2023 at 12:47 | vote | accept | Bugs Bunny | ||
| Sep 1, 2023 at 12:47 | comment | added | Bugs Bunny | And I was wrong: I have found my error. $\lambda^2 (x^3-3x)=1$, indeed. | |
| Sep 1, 2023 at 12:30 | comment | added | Bugs Bunny | I have seen this fellow. Somehow, I had $\lambda^2 (x^3-3x)=10$. Let me go through my calculation. | |
| Sep 1, 2023 at 9:59 | comment | added | Will Sawin | @BugsBunny It should be $x^3-3x$. | |
| Sep 1, 2023 at 7:07 | comment | added | Bugs Bunny | Thanks! I agree about $R({\mathbb C})$ but I am less certain about $R({\mathrm SL}_2 ({\mathbb C})$. I have calculated (possibly with an error, if you are right) all polynomials $y$ up to degree 4 with $\lambda^2(y)=1$ and $\lambda^3(y)=0$. These are only $2$, $x$, $x^2-2$ and $(x^2-2)^2-2$. In particular, there is no element (endomorphism) of degree 3. Could you say what element of degree 3 you are getting? | |
| Sep 1, 2023 at 1:41 | history | edited | Joe Silverman | CC BY-SA 4.0 |
fixed a typo (missing dollar sign)
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| Sep 1, 2023 at 1:14 | history | answered | Will Sawin | CC BY-SA 4.0 |