Changes

=== <math>\neg (r \leftrightarrow p) </math> ▶ <math>q \to \neg p</math> ===

=== <math> (p \land q) \to r </math> ▶ <math>q \to \neg p</math> ===

=== <math> \neg (r \leftrightarrow p), (p \land q) \to r </math> ▷ <math>q \to \neg p</math> ===

== Correção de regras ==

=== <math> (\to \mathrm{E}) \, \Gamma_1 \vdash \varphi \to \psi; \Gamma_2 \vdash \varphi \, / \, \Gamma_1,\Gamma_2 \vdash \psi </math> ===

=== <math> (\to \mathrm{I}) \, \Gamma, \varphi \vdash \psi \, / \, \Gamma \vdash \varphi\to\psi </math> ===

== Para reflexão ==