An alternative proof for the equivalence of ∞-searcher and 2-searcher

Tsunehiko Kameda, Ichiro Suzuki, Masafumi Yamashita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


It was conjectured in 1992 that the 2-searcher, who has two flashlights, has the same searching capability as the ∞-searcher, who has an omni-directional light source. Park et al. proved this conjecture affirmatively in 2001, but their proof is rather complicated and not easy to understand. In this paper we present an alternative proof, which we believe is conceptually more transparent and easier to understand. For this purpose, we introduce a tool called the 2-link visibility diagram that represents 2-link visibility, which has other applications.

Original languageEnglish
Pages (from-to)108-119
Number of pages12
JournalTheoretical Computer Science
Publication statusPublished - Jun 27 2016

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Computer Science(all)


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