@author C. H@sc{ANSON}
@author K. M. P@sc{ITMAN}
@author M. W@sc{AND}
-@author
@c {\it Dedicated to the Memory of ALGOL 60}
-@unnumbered Summary
+@majorheading Summary
The report gives a defining description of the programming language
and tan^-1 z are according to the following formulae:
-@center sin^-1 z = -i log (i z + sqrt1 - z^2)
+@center sin^-1 z = -i log (i z + sqrt(1 - z^2))