2.We learnt in class/Notes that A[x] → (Vx)A[x] is NOT atheorem if indeed occurs free in A.Yet, I think I got a proof: First, let me use DThm and prove insteadA[x] F (Vx)A[x]:(hyp)1) A[a]2) (Vx)A[a] (1 + Gen)Something must be wrong in my "PROOF"! What EXACTLY (not toomany words please and above all don't say "it's not a theorem"!)

Answered: hink Vr)A

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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