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2. Trace (linear algebra) - Wikipedia

   en.wikipedia.org/wiki/Trace_(linear_algebra)

   When both A and B are n × n matrices, the trace of the (ring-theoretic) commutator of A and B vanishes: tr([A, B]) = 0, because tr(AB) = tr(BA) and tr is linear. One can state this as "the trace is a map of Lie algebras gl n → k from operators to scalars", as the commutator of scalars is trivial (it is an Abelian Lie algebra ).

3. Proceedings of the Institution of Mechanical Engineers, Part F

   en.wikipedia.org/wiki/Proceedings_of_the...

   The Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit is a peer-reviewed scientific journal that covers on engineering applicable to rail and rapid transit. The journal was first published in 1989 as a split-off of Proceedings of the Institution of Mechanical Engineers.

4. List of medical abbreviations: T - Wikipedia

   en.wikipedia.org/wiki/List_of_medical...

   TR: tricuspid regurgitation: Tr: tincture: TRAM: transverse rectus abdominis myocutaneous flap TRAP: tartrate-resistant acid phosphatase: T2RF: type 2 respiratory failure: TRF: transfer (pronounced "turf") TRF'd: transferred (pronounced "turfed", as in "We just turfed Mrs Johnson OTD") TRH: thyrotropin-releasing hormone: TRT: testosterone ...

5. Fullbore target rifle - Wikipedia

   en.wikipedia.org/wiki/Fullbore_target_rifle

   Fullbore target rifle (TR) is a precision rifle shooting-sport discipline governed by the International Confederation of Fullbore Rifle Associations (ICFRA). [1] TR uses single-shot rifles, usually chambered in .308 calibre, with circular "bullseye" targets at distances of 300–1000 yards.

6. Jacobi's formula - Wikipedia

   en.wikipedia.org/wiki/Jacobi's_formula

   In matrix calculus, Jacobi's formula expresses the derivative of the determinant of a matrix A in terms of the adjugate of A and the derivative of A. [1]If A is a differentiable map from the real numbers to n × n matrices, then

7. Lockheed Martin (LMT) Q4 2024 Earnings Call Transcript - AOL

   www.aol.com/finance/lockheed-martin-lmt-q4-2024...

   We continue to expect deliveries will exceed the production rate over the next few years and estimate 170 to 190 F-35 aircraft deliveries in 2025. TR-3 capabilities continue to progress in flight ...