Volume 12, Issue 2 Eungil Ko Mee-Jung Lee Remarks on nearly equivalent operators Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Eungil Ko Mee-Jung Lee Find more articles with the same keywords nearly equivalent operators local spectral property invariant subspace Find more articles with the same subject classes 47B20 47A10