16
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Bug introduced in 9.0 and fixed in 10.0.0 and reintroduced in 11.2


Mathematica 9 on Windows and WolframAlpha says

Limit[Sin[Sqrt[x+1]]-Sin[Sqrt[x]],x->Infinity]

is Interval[{-2,2}]. But actually the limit is 0.

Limit[TrigFactor[Sin[Sqrt[x+1]]-Sin[Sqrt[x]]],x->Infinity]

gives 0 correctly.

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11
  • 5
    $\begingroup$ This is apparently a v9 bug. Version 8.04, 10.0.2, 10.1 and 10.2 all give 0. $\endgroup$ Sep 20, 2015 at 11:29
  • 1
    $\begingroup$ I'm voting to close this question as off-topic because Bug introduced in 9.0 and fixed in 10.0.0 $\endgroup$
    – user9660
    Oct 28, 2015 at 14:45
  • 1
    $\begingroup$ @Lou I'd rather leave this for V9 users. $\endgroup$
    – Kuba
    Oct 28, 2015 at 16:08
  • 3
    $\begingroup$ In v11.2, first limit has gone back to Interval[{-2, 2}] $\endgroup$
    – Bob Hanlon
    Sep 17, 2017 at 2:37
  • 1
    $\begingroup$ Sorry about that. 11.3 should get it right again. $\endgroup$ Sep 18, 2017 at 16:47

1 Answer 1

5
$\begingroup$

Case closed but the topic should be left here for future visitors who use V9.

So:

Bug introduced in 9.0 and fixed in 10.0.0

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2
  • $\begingroup$ In the spirit of community and user-oriented, Thanks! $\endgroup$
    – user9660
    Oct 28, 2015 at 17:05
  • $\begingroup$ @Lou Thanks comrade :) $\endgroup$
    – Kuba
    Oct 28, 2015 at 17:10

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