Volume 18, Issue 1 Wenhua Qian Dandan Xiao Tanghong Tao Wenming Wu Xin Yi Joint spectrum shrinking maps on projections 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 Wenhua Qian Dandan Xiao Tanghong Tao Wenming Wu Xin Yi Find more articles with the same keywords joint spectrum preserving joint spectrum shrinking Kaplansky problem projections Find more articles with the same subject classes 47B49 47A25