Research index·Journal articleNotesBIT Numerical Mathematics·1 Dec 1964DOI10.1007/bf01939519Journal articleNotesBIT Numerical Mathematics · 1964 · SubscriptionDOI10.1007/bf01939519ReadRead at the publisherSaveCiteAdd to literature reviewPaywalledThe full text is at the publisherOpen it at the publisher to read it.Read at the publisherDiscussionAdd to the discussionTopicsMathematicsRelated papersMoreDetailsPublished, publisher, issueSuggest a correction or report