\documentclass[12pt]{article} \usepackage{amssymb,amsmath} \pagestyle{empty} \begin{document} These are rules in implication form. \begin{align} &(Rule) &&(From) &&(To\,\,infer)\notag\\ &1.\,MP &&p,\,\,p\to q &&q\notag\\ &2.\,MT &&\sim q \to p,\,\,\sim p && q \notag\\ &3.\,DS &&p\vee q,\,\,\sim p && q \notag\\ &4.\,Simp &&p\cdot q && p \notag\\ &5.\,Conj &&p,\,\,q &&p\cdot q \notag\\ &6.\,HS &&p\to q,\,\, q\to r &&p\to r \notag\\ &7.\,Add &&p &&p\vee q \notag\\ &8.\,CD &&p\to r,\,\, q\to r,\,\, p\vee q &&r \notag \end{align} These are rules in equivalence form. \begin{align} &(Rule) &&(Original form) &&:: &&(Equivalence form) \notag\\ 9.\,&DN &&p &&:: &&\sim\sim p \notag\\ 10.\,&DeM &&\sim (p\cdot q) &&:: &&\sim p\vee \sim q \notag\\ &DeM &&\sim (p\vee q) &&:: &&\sim p\cdot \sim q \notag\\ 11.\,&Comm &&p\vee q &&:: &&q\vee p \notag\\ &Comm &&p\cdot q &&:: &&q\cdot p \notag\\ 12.\,&Asc &&p\vee (q\vee r) &&:: &&(p\vee q)\vee r \notag\\ &Asc &&p\cdot (q\cdot r) &&:: &&(p\cdot q)\cdot r \notag\\ 13.\,&Dist &&p\cdot (q\vee r) &&:: &&(p\cdot q)\vee (p\cdot r) \notag\\ &Dist &&p\vee (q\cdot r) &&:: &&(p\vee q)\cdot (p\vee r) \notag\\ 14.\,&Ctra &&p\to q &&:: &&\sim q\,\,\to\,\, \sim p \notag\\ 15.\,&Impl &&p\to q &&:: &&\sim p\vee q \notag\\ 16.\,&Exp &&(p\cdot q)\to r &&:: &&p\to (q\to r) \notag\\ 17.\,&Taut &&p &&:: &&p\cdot p \notag\\ &Taut &&p &&:: &&p\vee p \notag\\ 18.\,&Equi &&p\equiv q &&:: &&(p\to q)\cdot (q\to p) \notag\\ &Equi &&p\equiv q &&:: &&(p\cdot q)\vee (\sim p\cdot\sim q) \notag \end{align} \end{document}