Answer Happy

:: therefore I! arrow ".." or ".:" (colon and period, in either order) (dash + greater than), or simply ">" "<->" (less than + dash + greater than), or simply #double arrow conjunction (dot) "." (a period) V disjunction (wedge) "V" (lower case letter vee)

20. (EVF) →G, A=[(B v C)–(DE)] :: A-(CG) Use Reductio ad Absurdum Proofs (RAA) to show that each of the following symbolic arguments are valid. Commas mark the breaks between premises. 21. A™B ::-(AⓇB) 22. P→Q, PJ, Q+JQ 23. M−(N0), “NẠP,( MP)+(0v~Q) :: ~0+uQ 24. (D v E) →(F→G),(Gv H) → (D.F): G 25. (Z.Y) (W.X), z→Y, X+W:76x