Knowledge bases (KBs) about notable entities and their properties are an important asset in applications such as search, question answering and dialogue. All popular KBs capture virtually only positive statements, and abstain from taking any stance on statements not stored in the KB. In this work, we make the case for explicitly stating salient statements that do not hold. Negative statements are useful to overcome limitations of question answering, and can often contribute to informative summaries of entities. Due to the abundance of such invalid statements, any effort to compile them needs to address ranking by saliency.

• Wikinegata: a KB with Interesting Negative Statements.
  Hiba Arnaout, Simon Razniewski, Gerhard Weikum, Jeff Z. Pan
  VLDB 2021 - [PDF] [VIDEO]
• Negative Knowledge for Open-world Wikidata.
  Hiba Arnaout, Simon Razniewski, Gerhard Weikum, Jeff Z. Pan
  WWW Companion 2021 - [PDF] [LINK]
• Negative statements considered useful.
  Hiba Arnaout, Simon Razniewski, Gerhard Weikum, Jeff Z. Pan
  JWS 2021  - [PDF], [LINK]
• Enriching KBs with interesting negative statements.  
  Hiba Arnaout, Simon Razniewski, Gerhard Weikum
  AKBC 2020 - [PDF], [LINK]