About: http://webisa.webdatacommons.org/287892111

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	When an object to be measured is the spherical mirror 9 as in this example, the forming error H(x,y) is expressed by: ##EQU2## Where, .lambda. is a wavelength of the laser beam and K is a constant.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com