# Talk:Dyadic rational

The paragraph "The resulting topological group D is called the dyadic solenoid" does not make it clear whether D is the dyadic rationals or the dual group.  Quotient group (talk) 21:52, 6 December 2009 (UTC)

This article would benefit greatly if it covered the etymology and adoption of the term. Krushia (talk) 14:14, 31 December 2012 (UTC)

The first usage I can find is in "A Closed Set of Normal Orthogonal Functions", J. L. Walsh, Am. J. Math. 1923. But Walsh uses the term (or actually the variant "dyadically rational") without explaining it, so it may well have an earlier origin than that. I don't know of a reliable source that covers this history so I am reluctant to put it in because of our rules on original research. Anyway, this article is about the concept of a dyadic rational number, not about their name, and the concept goes back to the ancient Egyptians as the article already states. —David Eppstein (talk) 23:02, 14 June 2013 (UTC)

Isn't this a contradiction? "accurately" and "approximate" shouldn't be used together. ciao --Pentaclebreaker (talk) 08:43, 28 August 2021 (UTC)

There are precise bounds on how accurately these numbers can approximate arbitrary reals, later in the article. The sentence you are complaining about is the lead's summary of that later section. It is doing exactly what the lead is supposed to do, summarizing the content of the article. —David Eppstein (talk) 16:25, 28 August 2021 (UTC)