Gustafson, K. Doubling perturbation sizes and preservation of operator indices in normed linear spaces. (English) Zbl 0181.13801 Proc. Camb. Philos. Soc. 66, 281-294 (1969). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 5 Documents Keywords:functional analysis PDFBibTeX XMLCite \textit{K. Gustafson}, Proc. Camb. Philos. Soc. 66, 281--294 (1969; Zbl 0181.13801)