The set theory approach, which is often used in pure mathematics, can be applied to analyze relations between indigenous communities in Papua. This article maps cultural relations between three main indigenous communities Kamoro, Amungme, and Dani with a mathematical approach. Each community is represented as a collection of unique cultural elements, such as wood carving traditions (Kamoro), mountain beliefs (Amungme), and ancestral mummy traditions (Dani). This analysis involves the concepts of intersection, combination, and complementation to identify similarities, uniqueness, and potential conflicts and synergies between communities. This study found that although there is no direct cultural intersection, the combination of cultural elements shows significant richness. This approach provides a systematic tool for understanding relationships between communities, supporting cultural preservation, and creating social harmony.

Kaizen is one of the company's strategies in increasing business productivity. In addition to being related to production management, kaizen is also related to human resource management. This can be in line with increase in employee performance. The implementation of kaizen on the factors of improving employee performance can not necessarily be done instantly, there needs to be a thorough adaptation that takes a long time to implement. In case, the researchers try to examine "Kaizen and its Implementation of Factors That Improve Company Employee Performance" through literature studies from various sources such as articles, books, and scientific journals. It was found that there are various point of performance improvement in the implementation of kaizen in a company. Not all factors can match one company to another. The implementation of kaizen that not all can be applied to the company also requires adjustments. This research is expected provide knowledge about kaizen & employee performance for all readers.

This study discusses the concept of knowledgemanagement and also its application at PT. Humala isindependent. Knowledge management seeks to increaseuseful knowledge in an organization. Qualitativedescriptive method is a research method that the authoruses in this study. Knowledge Management is dividedinto two theories, namely resource based view theory(RBV) and knowledge based view theory (KBV). In thedelivery service company, knowledge management isapplied in the form of increasing resources and utilizingexisting information technology. The purpose of thisresearch is to analyze the application of knowledgemanagement at PT. Independent Active Humala. Theresults obtained in this study are PT. Humala GiatMandiri has implemented knowledge management well.