Ramanujan's congruences refer to a set of remarkable congruences related to partition numbers, which count the number of ways a given positive integer can be expressed as the sum of positive integers, without regard to the order of the summands.

Erich Fischer is not a widely recognized figure in historical texts, popular culture, or notable events up to my last update in October 2023. There may be various individuals named Erich Fischer in different contexts such as academics, arts, or sciences, but without more specific information, it's difficult to identify one particular person or significance. If you're referring to a specific Erich Fischer, could you please provide more context or details? This would help me offer a more accurate and relevant response.

Eric Vanden-Eijnden is a notable figure in the field of applied mathematics and computational science. He is known for his work in areas such as dynamical systems, numerical analysis, and machine learning, particularly in the context of studying complex systems. His research often involves the development of algorithms and techniques for simulating and understanding the behavior of dynamical systems and for applying these methods to practical problems.

Ernest William Brown (1866–1938) was an English mathematician and astronomer known for his work in celestial mechanics and astrodynamics. He contributed significantly to the development of astronomical theories and methods, particularly related to the calculation of planetary orbits. One of his notable achievements was in advancing the analytical techniques for solving the three-body problem and other complex orbital motions.

As of my last knowledge update in October 2023, there is no widely recognized individual, organization, or concept known as "Ernst Rexer." It is possible that it could refer to a lesser-known person or a new entity that emerged after that date.

Ernst Zermelo was a German mathematician known primarily for his foundational work in set theory. He was born on December 27, 1871, and died on May 21, 1953. Zermelo is most famous for developing the Zermelo-Fraenkel set theory (ZF), which is one of the most commonly used axiomatic set theories in mathematics.

Ethical formalism, often associated with the philosophy of Immanuel Kant, is an ethical theory that emphasizes the importance of duty, rules, and principles in moral decision-making. Key features of ethical formalism include: 1. **Deontological Framework**: Ethical formalism is a deontological theory, meaning it focuses on the inherent rightness or wrongness of actions themselves, rather than their consequences. This approach holds that certain actions are morally obligatory regardless of the outcomes they produce.

Étienne Biéler was a Swiss painter, born on May 15, 1898, and passed away on January 23, 1987. He is known for his contributions to the Swiss art scene, particularly in the fields of painting, drawing, and printmaking. His work often reflects a blend of various styles and influences, including modernism.

"European astronomer stubs" typically refers to short articles or entries on European astronomers in databases like Wikipedia that provide only minimal information. In a Wikipedia context, a "stub" is a term used for an article that is incomplete and in need of expansion. These articles may contain only basic details, such as the astronomer's name, birth and death dates, and a few key achievements, but lack in-depth biographical context, contributions to the field, or significant discoveries.

The European Conference on Underwater Acoustics (ECUA) is a significant scientific conference focused on the field of underwater acoustics and its various applications. It serves as a platform for researchers, engineers, and practitioners from around the world to discuss the latest developments, research findings, technologies, and methodologies related to underwater acoustics.

The European Language Resources Association (ELRA) is an organization dedicated to the collection, preservation, and dissemination of language resources, including corpora, lexicons, and speech databases, among others. Founded in 1995, ELRA aims to support research and development in the field of natural language processing (NLP) and computational linguistics by facilitating access to high-quality language resources and promoting their use in various applications, such as machine translation, information retrieval, and voice recognition.

The European Physical Journal D (EPJ D) is a peer-reviewed scientific journal that focuses on areas of research in quantum mechanics, statistical physics, condensed matter physics, and related topics. It is part of the larger European Physical Journal series, which publishes a variety of scientific journals covering different aspects of physics. EPJ D specifically emphasizes studies related to statistical physics, quantum information, nonlinear dynamics, and complex systems.

Eva Ramstedt does not appear to be a widely recognized public figure, historical personality, or a prominent topic as of my last update in October 2021. It is possible that she could be a contemporary individual or private figure not covered in major media or literature, or someone who has gained prominence after that date.

An **evasive Boolean function** is a specific type of Boolean function that exhibits a particular behavior in terms of how it is evaluated or how many inputs need to be queried to determine its value.