Selecting names of indexes that are not dependent on constraints.

Hey all,<br /><br />How can I select names of indexes of table (or even whole schema) that are not dependent on
constraints?<br/><br />Unfortunately there is no way to select only "independent" indexes from pg_indexes view.<br
/><br/>How can I do it?<br /><br />Regards,<br />Dmitriy Igrishin<br />