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  2. XY problem - Wikipedia

    en.wikipedia.org/wiki/XY_problem

    The XY problem is a communication problem encountered in help desk, technical support, software engineering, or customer service situations where the question is about an end user's attempted solution (X) rather than the root problem itself (Y or Why?

  3. Boolean algebra - Wikipedia

    en.wikipedia.org/wiki/Boolean_algebra

    For the second absorption law, x ∨ (x ∧ y) = x, start with the left diagram for x∧y and note that shading the whole of the x circle results in just the x circle being shaded, since the previous shading was inside the x circle. The double negation law can be seen by complementing the shading in the third diagram for ¬x, which shades the x ...

  4. Equation xy = yx - Wikipedia

    en.wikipedia.org/wiki/Equation_xy_=_yx

    "x^y = y^x - commuting powers". Arithmetical and Analytical Puzzles. Torsten Sillke. Archived from the original on 2015-12-28. dborkovitz (2012-01-29). "Parametric Graph of x^y=y^x". GeoGebra. OEIS sequence A073084 (Decimal expansion of −x, where x is the negative solution to the equation 2^x = x^2)

  5. Conditional expectation - Wikipedia

    en.wikipedia.org/wiki/Conditional_expectation

    The conditional expectation of X given Y is defined by applying the above construction on the σ-algebra generated by Y: ⁡ []:= ⁡ [()]. By the Doob–Dynkin lemma, there exists a function : such that

  6. Binomial theorem - Wikipedia

    en.wikipedia.org/wiki/Binomial_theorem

    In elementary algebra, the binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial.According to the theorem, the power ⁠ (+) ⁠ expands into a polynomial with terms of the form ⁠ ⁠, where the exponents ⁠ ⁠ and ⁠ ⁠ are nonnegative integers satisfying ⁠ + = ⁠ and the coefficient ⁠ ⁠ of each term is a specific positive integer ...

  7. XY sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XY_sex-determination_system

    Offspring have two sex chromosomes: an offspring with two X chromosomes (XX) will develop female characteristics, and an offspring with an X and a Y chromosome (XY) will develop male characteristics, except in various exceptions such as individuals with Swyer syndrome, that have XY chromosomes and a female phenotype, and de la Chapelle Syndrome ...

  8. Milne-Thomson method for finding a holomorphic function

    en.wikipedia.org/wiki/Milne-Thomson_method_for...

    He is really interested in problems 3 and 4, but the answers to the easier problems 1 and 2 are needed for proving the answers to problems 3 and 4. 1st problem

  9. Theory X and Theory Y - Wikipedia

    en.wikipedia.org/wiki/Theory_X_and_Theory_Y

    Theory X and Theory Y also have implications in military command and control (C2). Older, strictly hierarchical conceptions of C2, with narrow centralization of decision rights, highly constrained patterns of interaction, and limited information distribution tend to arise from cultural and organizational assumptions compatible with Theory X.