Timeline for Roots of an expression
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 3, 2018 at 17:33 | vote | accept | CommunityBot | ||
| Oct 3, 2018 at 17:24 | comment | added | user60516 | Yes, you are right. | |
| Oct 3, 2018 at 17:20 | comment | added | J. M.'s missing motivation♦ | "Negligible" only means small, and not always zero. You asked Mathematica for when it will exactly be zero, when you were interested in a different thing altogether. | |
| Oct 3, 2018 at 17:11 | answer | added | Carl Woll | timeline score: 3 | |
| Oct 3, 2018 at 17:11 | comment | added | user60516 | Yes. But the imaginary part is negligible to its real part when $r = 0.01$. | |
| Oct 3, 2018 at 17:09 | comment | added | bill s | I don't think r=0.01 is a root. Look at: Plot[Im[1 - 2 Sqrt[1 + I r] + I r], {r, 0, 0.012}] | |
| Oct 3, 2018 at 17:05 | comment | added | user60516 | Thanks. But it returns only $r = 0$. | |
| Oct 3, 2018 at 17:00 | comment | added | J. M.'s missing motivation♦ |
Try Solve[ComplexExpand[Im[1 - 2 Sqrt[1 + I r] + I r], TargetFunctions -> {Re, Im}] == 0, r, Reals]
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| Oct 3, 2018 at 16:55 | review | First posts | |||
| Oct 3, 2018 at 17:50 | |||||
| Oct 3, 2018 at 16:54 | history | asked | user60516 | CC BY-SA 4.0 |