This paper describes four tools for verification security protocols Athena, Casper, Isabelle and Murphi. Each tool is briefly characterized and implementation of protocol Needham Schroeder. One part of this paper is comparing of selected tools. The second part of this paper describes in detail a tool Athena and mentions examples of verified protocols. By each protocol is stated a specifications of communication, a detected attack and results of own verification. At the end compares this paper verification results with already publicated attacks.

To be successful and be effective in teaching, one must be familiar with a variety of methods in instruction and teaching strategies. This also includes becoming aware of any challenges that student and teachers might confront at all levels. Advanced-level piano students, such as those who are at the collegiate level, study the masterpieces of the great composers. However, they may still be in need of developing certain technical and musical skills which should have been covered at the late intermediate level. This study focuses both on exercises and on late intermediate-level repertoire. This study examined the methodical approaches of Russian technical school primarily through the exercises of Theodor Leschetizky, Isabelle Vengerova, and Heinrich Neuhaus and compared these exercises with passages from appropriate great literature suitable for late intermediate-level students. This may not only in preparing for more advanced piano repertoire but also broadening general piano techniques. All together, this may further promote in prevention of musical problems that might occur at a more advanced-level of piano study.This study focuses both on exercises and on late intermediate-level repertoire. This study examined the methodical approaches of Russian technical school primarily through the exercises of Theodor Leschetizky, Isabelle Vengerova, and Heinrich Neuhaus and compared these exercises with passages from appropriate great literature suitable for late intermediate-level students. This may not only in preparing for more advanced piano repertoire but also broadening general piano techniques. All together, this may further promote in prevention of musical problems that might occur at a more advanced-level of piano study.

Ce mémoire vient rendre compte du parcours qui m'a menée à l'exposition Lourd comme un cheval mort présentée dans la galerie de La Chambre Blanche. Ma recherche s'est axée sur l'ouverture des formes, des dimensions et des matériaux afin de faire évoluer l'oeuvre. Elle s'est de plus inspirée du cinéma pour exploiter les procédés de la narration à même un espace ouvert : celui de l'installation.

We present a series of improvements to the Hybrid system, a formal theory implemented in Isabelle/HOL to support specifying and reasoning about formal systems using higher-order abstract syntax (HOAS). We modify Hybrid's type of terms, which is built definitionally in terms of de Bruijn indices, to exclude at the type level terms with `dangling' indices. We strengthen the injectivity property for Hybrid's variable-binding operator, and develop rules for compositional proof of its side condition, avoiding conversion from HOAS to de Bruijn indices. We prove representational adequacy of Hybrid (with these improvements) for a lambda-calculus-like subset of Isabelle/HOL syntax, at the level of set-theoretic semantics and without unfolding Hybrid's definition in terms of de Bruijn indices. In further work, we prove an induction principle that maintains some of the benefits of HOAS even for open terms. We also present a case study of the formalization in Hybrid of a small programming language, Mini-ML with mutable references, including its operational semantics and a type-safety property. This is the largest case study in Hybrid to date, and the first to formalize a language with mutable references. We compare four variants of this formalization based on the two-level approach adopted by Felty and Momigliano in other recent work on Hybrid, with various specification logics (SLs), including substructural logics, formalized in Isabelle/HOL and used in turn to encode judgments of the object language. We also compare these with a variant that does not use an intermediate SL layer. In the course of the case study, we explore and develop new proof techniques, particularly in connection with context invariants and induction on SL statements.

We present a series of improvements to the Hybrid system, a formal theory implemented in Isabelle/HOL to support specifying and reasoning about formal systems using higher-order abstract syntax (HOAS). We modify Hybrid's type of terms, which is built definitionally in terms of de Bruijn indices, to exclude at the type level terms with `dangling' indices. We strengthen the injectivity property for Hybrid's variable-binding operator, and develop rules for compositional proof of its side condition, avoiding conversion from HOAS to de Bruijn indices. We prove representational adequacy of Hybrid (with these improvements) for a lambda-calculus-like subset of Isabelle/HOL syntax, at the level of set-theoretic semantics and without unfolding Hybrid's definition in terms of de Bruijn indices. In further work, we prove an induction principle that maintains some of the benefits of HOAS even for open terms. We also present a case study of the formalization in Hybrid of a small programming language, Mini-ML with mutable references, including its operational semantics and a type-safety property. This is the largest case study in Hybrid to date, and the first to formalize a language with mutable references. We compare four variants of this formalization based on the two-level approach adopted by Felty and Momigliano in other recent work on Hybrid, with various specification logics (SLs), including substructural logics, formalized in Isabelle/HOL and used in turn to encode judgments of the object language. We also compare these with a variant that does not use an intermediate SL layer. In the course of the case study, we explore and develop new proof techniques, particularly in connection with context invariants and induction on SL statements.

We present a series of improvements to the Hybrid system, a formal theory implemented in Isabelle/HOL to support specifying and reasoning about formal systems using higher-order abstract syntax (HOAS). We modify Hybrid's type of terms, which is built definitionally in terms of de Bruijn indices, to exclude at the type level terms with `dangling' indices. We strengthen the injectivity property for Hybrid's variable-binding operator, and develop rules for compositional proof of its side condition, avoiding conversion from HOAS to de Bruijn indices. We prove representational adequacy of Hybrid (with these improvements) for a lambda-calculus-like subset of Isabelle/HOL syntax, at the level of set-theoretic semantics and without unfolding Hybrid's definition in terms of de Bruijn indices. In further work, we prove an induction principle that maintains some of the benefits of HOAS even for open terms. We also present a case study of the formalization in Hybrid of a small programming language, Mini-ML with mutable references, including its operational semantics and a type-safety property. This is the largest case study in Hybrid to date, and the first to formalize a language with mutable references. We compare four variants of this formalization based on the two-level approach adopted by Felty and Momigliano in other recent work on Hybrid, with various specification logics (SLs), including substructural logics, formalized in Isabelle/HOL and used in turn to encode judgments of the object language. We also compare these with a variant that does not use an intermediate SL layer. In the course of the case study, we explore and develop new proof techniques, particularly in connection with context invariants and induction on SL statements.

O presente Estudo apresenta as discussões tecidas ao longo de uma pesquisa de doutorado na qual examinaram-se os relatos de viagem feitos por quatro viajantes-naturalistas franceses – Auguste de Saint-Hilaire, Arsene Isabelle, Nicolaus Dreys e Aimé Bompland -, que estiveram no Rio Grande do Sul na primeira metade do século XIX. A pesquisa inscreve-se no campo teórico dos Estudos Culturais e nela investigou-se a produção cultural da natureza engendrada nas formas como esses naturalistas narraram as diferentes paisagens do Rio Grande do Sul, naquele tempo. Neste trabalho, buscou-se mostrar que em diferentes tempos históricos produziram-se diferentes formas de falar, de narrar e, neste processo, de constituir discursivamente a natureza. E também destacar como a nossa percepção daquilo que consideramos como natureza está profundamente marcada por construções estéticas e culturais que estabelecem o que se deve ‘ver’, ‘admirar’, ‘conservar’ e ‘proteger’ no mundo dito “natural”. E é nesse sentido que se colocou em destaque, que a configuração da natureza como ‘selvagem`, ‘bela`,’inóspita`,’exótica´, ’sublime`, ’primitiva´,ou’pitoresca´, é sempre resultado de experiências arbitrárias constituídas histórica e culturalmente e processadas em meio a intensas negociações e disputas. Ainda, o presente estudo esteve atento para a diversidade inerente à complexa experiência cultural da viagem; ou seja, as viagens, embora inscritas e comprometidas com um projeto colonizador, abrigavam também, projetos particulares. Assim, os relatos dos viajantes aqui estudados, foram olhados na sua diversidade: diferentes modos de se deslocar pela região e de permanecer nos lugares, diversas formas de narrar, de compor a paisagem e de olhar o ‘outro’. Ao longo dessa pesquisa uma das questões norteadoras do trabalho foi investigar como, diante de uma paisagem ‘desconhecida’, os viajantes franceses transculturaram a paisagem natural do Rio Grande do Sul, na primeira metade do século XIX.

O presente Estudo apresenta as discussões tecidas ao longo de uma pesquisa de doutorado na qual examinaram-se os relatos de viagem feitos por quatro viajantes-naturalistas franceses – Auguste de Saint-Hilaire, Arsene Isabelle, Nicolaus Dreys e Aimé Bompland -, que estiveram no Rio Grande do Sul na primeira metade do século XIX. A pesquisa inscreve-se no campo teórico dos Estudos Culturais e nela investigou-se a produção cultural da natureza engendrada nas formas como esses naturalistas narraram as diferentes paisagens do Rio Grande do Sul, naquele tempo. Neste trabalho, buscou-se mostrar que em diferentes tempos históricos produziram-se diferentes formas de falar, de narrar e, neste processo, de constituir discursivamente a natureza. E também destacar como a nossa percepção daquilo que consideramos como natureza está profundamente marcada por construções estéticas e culturais que estabelecem o que se deve ‘ver’, ‘admirar’, ‘conservar’ e ‘proteger’ no mundo dito “natural”. E é nesse sentido que se colocou em destaque, que a configuração da natureza como ‘selvagem`, ‘bela`,’inóspita`,’exótica´, ’sublime`, ’primitiva´,ou’pitoresca´, é sempre resultado de experiências arbitrárias constituídas histórica e culturalmente e processadas em meio a intensas negociações e disputas. Ainda, o presente estudo esteve atento para a diversidade inerente à complexa experiência cultural da viagem; ou seja, as viagens, embora inscritas e comprometidas com um projeto colonizador, abrigavam também, projetos particulares. Assim, os relatos dos viajantes aqui estudados, foram olhados na sua diversidade: diferentes modos de se deslocar pela região e de permanecer nos lugares, diversas formas de narrar, de compor a paisagem e de olhar o ‘outro’. Ao longo dessa pesquisa uma das questões norteadoras do trabalho foi investigar como, diante de uma paisagem ‘desconhecida’, os viajantes franceses transculturaram a paisagem natural do Rio Grande do Sul, na primeira metade do século XIX.

O presente Estudo apresenta as discussões tecidas ao longo de uma pesquisa de doutorado na qual examinaram-se os relatos de viagem feitos por quatro viajantes-naturalistas franceses – Auguste de Saint-Hilaire, Arsene Isabelle, Nicolaus Dreys e Aimé Bompland -, que estiveram no Rio Grande do Sul na primeira metade do século XIX. A pesquisa inscreve-se no campo teórico dos Estudos Culturais e nela investigou-se a produção cultural da natureza engendrada nas formas como esses naturalistas narraram as diferentes paisagens do Rio Grande do Sul, naquele tempo. Neste trabalho, buscou-se mostrar que em diferentes tempos históricos produziram-se diferentes formas de falar, de narrar e, neste processo, de constituir discursivamente a natureza. E também destacar como a nossa percepção daquilo que consideramos como natureza está profundamente marcada por construções estéticas e culturais que estabelecem o que se deve ‘ver’, ‘admirar’, ‘conservar’ e ‘proteger’ no mundo dito “natural”. E é nesse sentido que se colocou em destaque, que a configuração da natureza como ‘selvagem`, ‘bela`,’inóspita`,’exótica´, ’sublime`, ’primitiva´,ou’pitoresca´, é sempre resultado de experiências arbitrárias constituídas histórica e culturalmente e processadas em meio a intensas negociações e disputas. Ainda, o presente estudo esteve atento para a diversidade inerente à complexa experiência cultural da viagem; ou seja, as viagens, embora inscritas e comprometidas com um projeto colonizador, abrigavam também, projetos particulares. Assim, os relatos dos viajantes aqui estudados, foram olhados na sua diversidade: diferentes modos de se deslocar pela região e de permanecer nos lugares, diversas formas de narrar, de compor a paisagem e de olhar o ‘outro’. Ao longo dessa pesquisa uma das questões norteadoras do trabalho foi investigar como, diante de uma paisagem ‘desconhecida’, os viajantes franceses transculturaram a paisagem natural do Rio Grande do Sul, na primeira metade do século XIX.

We present a series of improvements to the Hybrid system, a formal theory implemented in Isabelle/HOL to support specifying and reasoning about formal systems using higher-order abstract syntax (HOAS). We modify Hybrid's type of terms, which is built definitionally in terms of de Bruijn indices, to exclude at the type level terms with `dangling' indices. We strengthen the injectivity property for Hybrid's variable-binding operator, and develop rules for compositional proof of its side condition, avoiding conversion from HOAS to de Bruijn indices. We prove representational adequacy of Hybrid (with these improvements) for a lambda-calculus-like subset of Isabelle/HOL syntax, at the level of set-theoretic semantics and without unfolding Hybrid's definition in terms of de Bruijn indices. In further work, we prove an induction principle that maintains some of the benefits of HOAS even for open terms. We also present a case study of the formalization in Hybrid of a small programming language, Mini-ML with mutable references, including its operational semantics and a type-safety property. This is the largest case study in Hybrid to date, and the first to formalize a language with mutable references. We compare four variants of this formalization based on the two-level approach adopted by Felty and Momigliano in other recent work on Hybrid, with various specification logics (SLs), including substructural logics, formalized in Isabelle/HOL and used in turn to encode judgments of the object language. We also compare these with a variant that does not use an intermediate SL layer. In the course of the case study, we explore and develop new proof techniques, particularly in connection with context invariants and induction on SL statements.