17.13 Error codes
In addition to the standard error codes for invalid arguments the
functions can return the following values,
- the maximum number of subdivisions was exceeded.
- cannot reach tolerance because of roundoff error,
or roundoff error was detected in the extrapolation table.
- a non-integrable singularity or other bad integrand behavior was found
in the integration interval.
- the integral is divergent, or too slowly convergent to be integrated
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