Exercícios de Dedução Natural

Dedução Natural para a Lógica Proposicional Intuicionista

1. Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \varphi \land \psi \vdash \psi \land \varphi}

2. Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle (\varphi \land \psi) \land \delta \vdash \varphi \land (\psi \land \delta)}

3. Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha \vdash \alpha \land \alpha}
4. Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \alpha \land \beta, \gamma \land \delta \vdash \gamma \land \beta}

Dedução Natural para a Lógica Proposicional Clássica

• Derivações na forma de árvores rotuladas com fórmulas

1. Terceiro Excluído / Tertium Non Datur: Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \vdash\varphi\lor\neg\varphi}
   Tarefa: Demonstrar a mesma fórmula, invertendo a ordem de aplicação das regras de introdução da disjunção.

Veja também

• Dedução Natural
• Estratégias de demonstração