Troubles with Integrate

• To: mathgroup at smc.vnet.net
• Subject: [mg70225] Troubles with Integrate
• From: "Roman V. Kiseliov" <unicorn at kurskline.ru>
• Date: Sat, 7 Oct 2006 07:09:35 -0400 (EDT)

```If I try to do following calculation Mathematica 5.2.0.0 can't evaluate
integrals.

psi:= (-Pi^(-1))*((Sin[Pi*((t - 5/4)/3)]/(t - 5/4))*Cos[Pi*(t - 5/4)] +
(Sin[Pi*(t + 1/4)]/(t + 1/4))*Cos[Pi*(t + 1/4)]) +
(1/Pi)*((Sin[2*Pi*((t - 7/8)/3)]/(t - 7/8))*Sin[2*Pi*(t - 7/8)] -
(Sin[2*Pi*((t - 1/8)/3)]/(t - 1/8))*Sin[2*Pi*(t - 1/8)]);

Integrate[psi*psi, t]
Integrate[psi*psi, {t, -inf, +inf}]

If I try to interrupt calculation, Mathematica sometimes says
'Mathematica has detected a possible internal error. If possible, report
the error to
support at wolfram.com, quoting "Assertion 'interruptMenuType != 0' failed at
KernelPackets.c:726", and describe in as much detail as possible what
you were
doing when the error occurred.'

Note also that Integrate[psi, {t, -inf, +inf}] in Mathematica 4.2.0.0
evaluates as 0
but Mathematica 5.2.0.0 give value -1/2

Roman V. Kiseliov
Kursk State University
Theor. Phys. Dept.

```

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