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Name "Math::Interval::a" used only once: possible typo at C:\SRC\ivpm.
+pl line 39.
Name "Math::Interval::b" used only once: possible typo at C:\SRC\ivpm.
+pl line 39.

Can't call method "abs" on an undefined value at C:\SRC\ivpm.pl line 3
+9.

#!/usr/bin/perl
package Math::Interval;
...
];

print 'mat norm ', Math::Interval::matrix_norm($x), "\n";