Original poster: Mddeming-at-aol-dot-com In a message dated 8/6/04 10:22:56 PM Eastern Daylight Time, tesla-at-pupman-dot-com writes: Example: ln (b meters/ a meters) becomes ln (b) ? ln (a) ln (b meters / a meters) = ln(b/a) = ln(b) - ln(a) which is a dimensionless number. Matt D.