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  2. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  3. B1 Preliminary - Wikipedia

    en.wikipedia.org/wiki/B1_Preliminary

    Both versions of the exam (B1 Preliminary and B1 Preliminary for Schools) are made up of three exam papers, which cover all four language skills (Reading, Writing, Listening and Speaking). The Speaking paper is taken face-to-face and candidates have the choice of taking the Reading and Writing paper and Listening paper on either a computer or ...

  4. List of unsolved problems in neuroscience - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Or just as prosthetic limbs can become part of the body, can handwritten notes become part of the mind? Mind-body dualism: Is the mind distinct from the body? Modularity of mind: Is the mind composed of distinct modules, each evolved to solve a specific evolutionary problem from the past? Dynamical neuroscience: Is the mind a dynamical system?

  5. Beal conjecture - Wikipedia

    en.wikipedia.org/wiki/Beal_conjecture

    To illustrate, the solution + = has bases with a common factor of 3, the solution + = has bases with a common factor of 7, and + = + has bases with a common factor of 2. Indeed the equation has infinitely many solutions where the bases share a common factor, including generalizations of the above three examples, respectively

  6. Oxford Placement Test - Wikipedia

    en.wikipedia.org/wiki/Oxford_Placement_Test

    The Oxford Placement Test (OPT), also called the Oxford Online Placement Test (OOPT), is an on demand computer-adaptive test of the English language for non-native speakers of English, reporting at Pre-A1, A1, A2, B1, B2, C1, and C2 levels of the Common European Framework of Reference (CEFR).

  7. Riemann hypothesis - Wikipedia

    en.wikipedia.org/wiki/Riemann_hypothesis

    The real part (red) and imaginary part (blue) of the Riemann zeta function ζ(s) along the critical line in the complex plane with real part Re(s) = 1/2. The first nontrivial zeros, where ζ(s) equals zero, occur where both curves touch the horizontal x-axis, for complex numbers with imaginary parts Im(s) equaling ±14.135, ±21.022 and ±25.011.

  8. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Mathematics has a remarkable ability to cross cultural boundaries and time periods. As a human activity, the practice of mathematics has a social side, which includes education, careers, recognition, popularization, and so on. In education, mathematics is a core part of the curriculum and forms an important element of the STEM academic disciplines.

  9. Common European Framework of Reference for Languages

    en.wikipedia.org/wiki/Common_European_Framework...

    An intergovernmental symposium in 1991 titled "Transparency and Coherence in Language Learning in Europe: Objectives, Evaluation, Certification" held by the Swiss Federal Authorities in the Swiss municipality of Rüschlikon found the need for a common European framework for languages to improve the recognition of language qualifications and help teachers co-operate.