Theorem spi 2220

Description: Inference rule of universal instantiation, or universal specialization. Converse of the inference rule of (universal) generalization ax-gen 1827. Contrary to the rule of generalization, its closed form is valid, see sp 2219. (Contributed by NM, 5-Aug-1993.)

Hypothesis

Ref	Expression
spi.1	⊢ ∀𝑥𝜑

Assertion

Ref	Expression
spi	⊢ 𝜑

Proof of Theorem spi

Step	Hyp	Ref	Expression
1		spi.1	. 2 ⊢ ∀𝑥𝜑
2		sp 2219	. 2 ⊢ (∀𝑥𝜑 → 𝜑)
3	1, 2	ax-mp 5	1 ⊢ 𝜑

This proof depends on syntax axioms:  ∀wal 1567

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-12 2212

This proof depends on definitions:  df-bi 210  df-ex 1812

This theorem is used by:  dariiALT  2690  barbariALT  2694  festinoALT  2699  barocoALT  2701  daraptiALT  2709  nfnfc  2934  axac2  10548  axac  10549  axaci  10550  bnj864  35599  axsepg2  35865  axsepg4  35868  axpowg2  35872  axpowg3  35873  in-ax8  37106  bj-snexg  38040  bj-unexg  38044  bj-adjg1  38049  sticksstones1  43290  sticksstones2  43291  rr-grothprim  45378  rr-grothshort  45382