Mathematical Logic Quarterly 51 (1):77-82 (2005)

Abstract
We prove in the framework of Bishop's constructive mathematics that the sequential completion equation image of the space [MATHEMATICAL SCRIPT CAPITAL D] is filter-complete. Then it follows as a corollary that the filter-completeness of [MATHEMATICAL SCRIPT CAPITAL D] is equivalent to the principle BD-ℕ, which can be proved in classical mathematics, Brouwer's intuitionistic mathematics and constructive recursive mathematics of Markov's school, but does not in Bishop's constructive mathematics. We also show that equation image is identical with the filter-completion which was provided by Bishop
Keywords BD‐ℕ  pseudobounded  filter‐completeness  sequential completeness  Constructive mathematics
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DOI 10.1002/malq.200310128
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