Theorem spi 2191

Description: Inference rule of universal instantiation, or universal specialization. Converse of the inference rule of (universal) generalization ax-gen 1796. Contrary to the rule of generalization, its closed form is valid, see sp 2190. (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 2190	. 2 ⊢ (∀𝑥𝜑 → 𝜑)
3	1, 2	ax-mp 5	1 ⊢ 𝜑

Syntax hints:  ∀wal 1539

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-12 2184

This theorem depends on definitions:  df-bi 207  df-ex 1781

This theorem is referenced by:  dariiALT  2666  barbariALT  2670  festinoALT  2675  barocoALT  2677  daraptiALT  2685  nfnfc  2911  kmlem2  10062  axac2  10376  axac  10377  axaci  10378  bnj864  35078  in-ax8  36418  bj-snexg  37235  bj-unexg  37239  bj-adjg1  37244  sticksstones1  42396  sticksstones2  42397  rr-grothprim  44537  rr-grothshort  44541