Formal topologies o the set of first-order formulae [1 citations — 1 self]
by Thierry Coquand, Sara Sadocco, Giovanni Sambin, Jan M. Smith
Journal of Symbolic Logic
ftp://ftp.cs.chalmers.se/pub/cs-reports/papers/smith/logiccovers.ps.gz
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Abstract:
The completeness proof for first-order logic by Rasiowa and Sikorski [13] is a simplification of Henkin's proof [7] in that it avoids the addition of infinitely many new individual constants. Instead they show that each consistent set of

