<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><blockquote type="cite" class="">On Jul 1, 2016, at 2:33 PM, David Waite via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""></blockquote><div class=""></div><blockquote type="cite" class=""><div class=""><br class=""></div><div class="">That only is about tau, which is a much more controversial operator. Unfortunately, I wasn’t able to find the discussion of pi or E in the archives (but neither pi nor e are very searchable)</div></blockquote><div class=""><br class=""></div><div class=""><a href="https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160411/015021.html" class="">https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160411/015021.html</a></div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class=""><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">In general, the line for mathematical functions appears to have been set pretty high for inclusion in SE-0067, focusing instead on IEEE 754 capabilities and general design/naming. There are a number of features missing from a standard math library such as the ability to do trigonometric and hyperbolic operations, exponential and logarithmic operations, and so on. I am not sure what criteria determined where this line was drawn. I suspect it was trying to get to a point of just additive changes.</div></div></blockquote><br class=""></div><div>That’s exactly right.</div><div><br class=""></div><div>I expect that math functions and constants will eventually make up a math protocol, separate from FloatingPoint. For the short-term, that niche is filled by the C standard library. `pi` is so frequently used that we made an exception for it.</div><div><br class=""></div><div>– Steve</div></body></html>