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logica-atividades's Introduction

Atividades de Lógica

Universidade de Brasília

Filosofia Noturno - 2017.2

Atividades da disciplina de Lógica ministrada pelo Professor Alexandre Costa-Leite

  1. Mostre usando tabela verdade se os argumentos são válidos ou inválidos

    • P → Q , Q ⊨ P

    • P → Q , ⌝ P ⊨ ⌝ Q

  2. Apresente contra-exemplos para cada fórmula abaixo

    • P → ( Q → ( R → T ) )

    • P ↔ ( R ∧ ⌝ S )

    • ⌝ ⌝ P ↔ ⌝ ⌝ ⌝ R

    • ( ( P ∧ Q ) ∧ ( R ∧ S ) ) → ( T ∨ U )

    • ( P ∨ Q ) ∨ ( R ∨ S )

  3. Mostre que os argumentos são válidos

    • ⌝ P ∧ ⌝ Q ⊨ ⌝ ( P ∧ Q )

    • P , ⌝ P ⊨ Q

    • P ⊨ P

    • P , Q , R , S , T , U , V , X ⊨ ( ( P ∧ Q ) ∧ ( R ∧ S ) ) ∧ ( T ∧ U )

    • P ⊨ ( P ∨ Q )

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