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Piotr Zieliński
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Publications

Journal papers

Conference papers

PhD Thesis

Technical Reports

Unpublished notes

  • Sub-Consensus hierarchy is false

    Consider an n-process asynchronous shared memory system. Each query to the ¬Ωk failure detector outputs n-k processes; at least one correct process is eventually never output. The "folklore" sub-Consensus hierarchy conjecture states that any task not solvable with ¬Ωk requires ¬Ωk-1. The case k=n is true: any non-free-implementable task requires ¬Ωn-1. In general, however, the conjecture is false.

  • Optimal codes for human beings

    Standard T9 coding system is suboptimal. Dasher requires constant feedback. This paper presents a coding system that is human-friendly, easily memorizable, and optimal in some precisely defined sense. It has been implemented in Tapir.

Posters and Talks