Arb is an implementation of ball arithmetic, also known as mid-rad interval
arithmetic. Ball arithmetic is an extension of floating-point arithmetic in
which an error bound is attached to each variable. This allows computing
rigorously with real and complex numbers.
With plain floating-point arithmetic, the user must do an error analysis to
guarantee that results are correct. Manual error analysis is time-consuming and
bug-prone. Ball arithmetic effectively makes error analysis automatic.
Arb is designed for computer algebra and computational number theory, but may be
useful in any area demanding reliable or precise numerical computing. Arb scales
seamlessly from tens of digits up to billions of digits. Efficiency is achieved
by low level optimizations and use of asymptotically fast algorithms.
Remove WWW entries moved into port Makefiles
Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.
This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.
Approved by: portmgr (tcberner)
Add WWW entries to port Makefiles
It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.
Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.
There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.
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