It is surely evident to everyone that e-mail is not yet a service which is capable of reliably transmitting any full character set. This certainly creates difficulties in scientific communication by this medium, difficulties made more acute for category theorists by the visual nature of our work. In order to give subscribers information about the channel from this node to you, this transmission includes a character code reference. You will observe some anomalies - at minimum, parentheses are where square brackets should be. That is the only problem I am aware of which originates locally, and there is hope it can be fixed. However, to ease the receipt difficulties of others, the avoidance of vertical bar(|), hat (^) and tilde (~), though this is clearly difficult, would be helpful. Character code reference: Upper case letters: ABCDEFGHIJKLMNOPQRSTUVWXYZ Lower case letters: abcdefghijklmnopqrstuvwxyz Digits: 0123456789 Square, curly, angle braces, parentheses: [] {} <> () Backslash, slash, vertical bar: \ / | Punctuation: . ? ! , : ; Underscore, hyphen, equals sign: _ - = Quotes--right left double: ' ` " "at", "number" "dollar", "percent", "and": @ # $ % & "hat", "star", "plus", "tilde": ^ * + ~