Theorem pm2.01d 190

Description: Deduction based on reductio ad absurdum. (Contributed by NM, 18-Aug-1993.) (Proof shortened by Wolf Lammen, 5-Mar-2013.)

Hypothesis

Ref	Expression
pm2.01d.1	⊢ (𝜑 → (𝜓 → ¬ 𝜓))

Assertion

Ref	Expression
pm2.01d	⊢ (𝜑 → ¬ 𝜓)

Proof of Theorem pm2.01d

Step	Hyp	Ref	Expression
1		pm2.01d.1	. 2 ⊢ (𝜑 → (𝜓 → ¬ 𝜓))
2		id 22	. 2 ⊢ (¬ 𝜓 → ¬ 𝜓)
3	1, 2	pm2.61d1 180	1 ⊢ (𝜑 → ¬ 𝜓)

Syntax hints:  ¬ wn 3   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem is referenced by:  pm2.65d  196  pm2.01da  798  swopo  5543  onssneli  6434  oalimcl  8487  rankcf  10688  prlem934  10944  supsrlem  11022  rpnnen1lem5  12894  rennim  15162  smu01lem  16412  opsrtoslem2  22011  cfinufil  23872  alexsub  23989  ostth3  27605  4cyclusnfrgr  30367  cvnref  32366  pconnconn  35425  untelirr  35902  dfon2lem4  35978  heiborlem10  38021  mod2addne  47610  pgnioedg1  48354  pgnioedg2  48355  pgnioedg3  48356  pgnioedg4  48357  pgnioedg5  48358  lindslinindsimp1  48703