Typos in procedure names index Wolfgang Corcoran-Mathe 17 Feb 2021 17:34 UTC

The names of the `isubset' procedures in the Index section are
incorrectly listed as isubset=?, isubset<?, etc.  I'd like to fix
this as an erratum.  Patch attached.

Best regards,

Wolfgang Corcoran-Mathe  <xxxxxx@sigwinch.xyz>

"The most important computer is the one that rages in our skulls
and ever seeks that satisfactory external emulator." --Alan J. Perlis