  The Agora system is a prototype "Wiki for Formal Mathematics", with an aim to
support developing and documenting large formalizations of mathematics in a
proof assistant. The functions implemented in Agora include in-browser editing,
strong AI/ATP proof advice, verification, and HTML rendering. The HTML
rendering contains hyperlinks and provides on-demand explanation of the proof
state for each proof step. In the present paper we show the prototype Flyspeck
Wiki as an instance of Agora for HOL Light formalizations. The wiki can be used
for formalizations of mathematics and for writing informal wiki pages about
mathematics. Such informal pages may contain islands of formal text, which is
used here for providing an initial cross-linking between Hales's informal
Flyspeck book, and the formal Flyspeck development.
  The Agora platform intends to address distributed wiki-style collaboration on
large formalization projects, in particular both the aspect of immediate
editing, verification and rendering of formal code, and the aspect of gradual
and mutual refactoring and correspondence of the initial informal text and its
formalization. Here, we highlight these features within the Flyspeck Wiki.
