(42steps) PrintForm Definitions formula equality Sections ClassicalProps(jlc) Doc

At: discrete Formula 1 5 1
1. Q: FormulaProp
2. x:{x:Formula| Q(x) }, y:Formula. Dec(x = y)
3. y2: {x:Formula| Q(x) }
4. y3: Formula
5. Q(y3)
6. y@0: Formula

Dec(y2y3 = y@0)
By: let Solver FalseCase THEN FormulaEquality -1 in FormulaCases -1 THENL [Solver;Solver;Solver;Solver;Id]
Generated subgoal:

17. y1: Formula
8. y4: Formula
Dec(y2y3 = y1y4)

About:
decidablesetapplyfunctionequalpropall

(42steps) PrintForm Definitions formula equality Sections ClassicalProps(jlc) Doc