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  2. Involution (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Involution_(mathematics)

    Any involution is a bijection.. The identity map is a trivial example of an involution. Examples of nontrivial involutions include negation (x ↦ −x), reciprocation (x ↦ 1/x), and complex conjugation (z ↦ z) in arithmetic; reflection, half-turn rotation, and circle inversion in geometry; complementation in set theory; and reciprocal ciphers such as the ROT13 transformation and the ...

  3. Dagger category - Wikipedia

    en.wikipedia.org/wiki/Dagger_category

    In this example, a self-adjoint morphism is a symmetric relation. The category Cob of cobordisms is a dagger compact category , in particular it possesses a dagger structure. The category Hilb of Hilbert spaces also possesses a dagger structure: Given a bounded linear map f : A → B {\displaystyle f:A\rightarrow B} , the map f † : B → A ...

  4. T-norm fuzzy logics - Wikipedia

    en.wikipedia.org/wiki/T-norm_fuzzy_logics

    Involutive negation (unary) can be added as an additional negation to t-norm logics whose residual negation is not itself involutive, that is, if it does not obey the law of double negation . A t-norm logic L {\displaystyle L} expanded with involutive negation is usually denoted by L ∼ {\displaystyle L_{\sim }} and called L {\displaystyle L ...

  5. Racks and quandles - Wikipedia

    en.wikipedia.org/wiki/Racks_and_quandles

    In mathematics, racks and quandles are sets with binary operations satisfying axioms analogous to the Reidemeister moves used to manipulate knot diagrams.. While mainly used to obtain invariants of knots, they can be viewed as algebraic constructions in their own right.

  6. Involute - Wikipedia

    en.wikipedia.org/wiki/Involute

    In mathematics, an involute (also known as an evolvent) is a particular type of curve that is dependent on another shape or curve. An involute of a curve is the locus of a point on a piece of taut string as the string is either unwrapped from or wrapped around the curve.

  7. Her daughter's suicide shocked the community. Now, she's ...

    www.aol.com/her-daughters-suicide-shocked...

    So, when the Washington, D.C. math teacher heard her daughter's alarm clock continue to ring one morning, she didn't think anything of it. Isabel Nugent at the beach.

  8. Wall St set for higher open as markets await megacap ... - AOL

    www.aol.com/news/futures-march-higher-markets...

    (Reuters) -Wall Street was set to open higher on Monday, with the main U.S. stock indexes poised to recoup some losses following a turbulent trading week, ahead of key corporate earnings and the ...

  9. Frobenius theorem (differential topology) - Wikipedia

    en.wikipedia.org/wiki/Frobenius_theorem...

    In the vector field formulation, the theorem states that a subbundle of the tangent bundle of a manifold is integrable (or involutive) if and only if it arises from a regular foliation. In this context, the Frobenius theorem relates integrability to foliation; to state the theorem, both concepts must be clearly defined.

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