Download Tropical and Idempotent Mathematics: International Workshop by G. L. Litvinov, S. N. Sergeev PDF

By G. L. Litvinov, S. N. Sergeev

This quantity is a suite of papers from the foreign convention on Tropical and Idempotent arithmetic, held in Moscow, Russia in August 2007. this can be a really new department of mathematical sciences that has been quickly constructing and becoming more popular during the last decade. Tropical arithmetic could be seen a result of Maslov dequantization utilized to 'traditional' arithmetic over fields. Importantly, functions in econophysics and statistical mechanics bring about a proof of the character of monetary crises. one other unique program offers an research of instabilities in electricity networks. Idempotent research, tropical algebra, and tropical geometry are the development blocks of the topic. Contributions to idempotent research are considering the Hamilton-Jacobi semigroup, the max-plus finite aspect strategy, and at the representations of eigenfunctions of idempotent linear operators. Tropical algebras, which include plurisubharmonic capabilities and their germs, are tested. the amount additionally includes very important surveys and learn papers on tropical linear algebra and tropical convex geometry

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Read Online or Download Tropical and Idempotent Mathematics: International Workshop TROPICAL-07 Tropical and Idempotent Mathematics August 25-30, 2007, Independent University ... J.-v. Ponnc PDF

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Additional resources for Tropical and Idempotent Mathematics: International Workshop TROPICAL-07 Tropical and Idempotent Mathematics August 25-30, 2007, Independent University ... J.-v. Ponnc

Example text

21. When S = Rmax , Develin, Santos, and Sturmfels [DSS05] considered an additional rank, the Kapranov rank, which is defined by thinking of max-plus (or rather min-plus) scalars as images of Puiseux series by a nonarchimedean valuation. This notion is of a different nature, and therefore is out of the scope of this paper. 8. Comparison of rank functions We now give the main comparison results for rank functions over Rmax . The proof of these rely on the results on max-plus linear systems and in particular on the “Cramer rules” established in Section 6.

The matrix ⎡ ¼ ⎢½ ⎢ ⎢½ F =⎢ ⎢¼ ⎢ ⎣½ ¼ ½ ¼ ¼ ½ ½ ¼ ½ ¼ ½ ¼ ¼ ½ ½ ¼ ½ ¼ ½ ¼ ½ ½ ¼ ¼ ¼ ¼ ¼ ¼ ½ ½ ¼ ¼ ⎤ ¼ ¼⎥ ⎥ ¼⎥ ⎥ ∈ M6,7 (Rmax ) ¼⎥ ⎥ ½⎦ ½ is such that mrGM (F ) = 6 > mcGM (F ) = rkdet (F ) = 5. 32 ´ MARIANNE AKIAN, STEPHANE GAUBERT, AND ALEXANDER GUTERMAN Before proving this proposition, let us explain the idea leading to this example, which originates from [Gau92]. 9). We make the following observations. Claim 1. Every maximal minor of F is balanced. Indeed, any pair of columns of F contains a minor of order 2 which is equal to ½◦ , and so, when expanding any minor of order 3 with respect to any column, at least one of the terms in the expansion must be equal to ½◦ .

Proof. (1) The lower bound of r(A|B) follows easily from the definition. ) 36 ´ MARIANNE AKIAN, STEPHANE GAUBERT, AND ALEXANDER GUTERMAN (2) The upper bound follows directly from the definitions. 12, and B is obtained from A by exchanging its first and third rows, one has that c(A) = c(B) = 4, but c(A|B) = 3 < 4. 17]. (4) The lower bound is evident. Observe that (A|B) = [A, ¼] ⊕ [¼, B] where ¼ denotes the zero matrix of an arbitrary dimension. 1, Assertion 3. 1, Assertion 2. Acknowledgments This paper was written when the third author was visiting the Maxplus team at INRIA, Paris - Rocquencourt, and INRIA, Saclay - ˆIle-de-France.

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