Nuprl Lemma : all_functionality_wrt_iff
∀[S,T:Type]. ∀[P,Q:S ⟶ ℙ]. (∀x:S. (P[x] ⇐⇒ Q[x])) ⇒ (∀x:S. P[x] ⇐⇒ ∀y:T. Q[y]) supposing S = T ∈ Type
Proof
Definitions occuring in Statement :
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
prop: ℙ,
so_apply: x[s],
all: ∀x:A. B[x],
iff: P ⇐⇒ Q,
implies: P ⇒ Q,
function: x:A ⟶ B[x],
universe: Type,
equal: s = t ∈ T
Definitions unfolded in proof :
member: t ∈ T,
uall: ∀[x:A]. B[x],
so_lambda: λ2x.t[x],
so_apply: x[s],
prop: ℙ,
uimplies: b supposing a,
implies: P ⇒ Q,
iff: P ⇐⇒ Q,
and: P ∧ Q,
all: ∀x:A. B[x],
rev_implies: P ⇐ Q
Lemmas referenced :
equal_wf,
iff_wf,
all_wf
Rules used in proof :
hyp_replacement,
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
hypothesisEquality,
equalitySymmetry,
hypothesis,
cut,
lemma_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
sqequalRule,
lambdaEquality,
applyEquality,
cumulativity,
because_Cache,
instantiate,
universeEquality,
functionEquality,
isect_memberFormation,
introduction,
axiomEquality,
rename,
lambdaFormation,
independent_pairFormation,
dependent_functionElimination,
productElimination,
independent_functionElimination
Latex:
\mforall{}[S,T:Type]. \mforall{}[P,Q:S {}\mrightarrow{} \mBbbP{}]. (\mforall{}x:S. (P[x] \mLeftarrow{}{}\mRightarrow{} Q[x])) {}\mRightarrow{} (\mforall{}x:S. P[x] \mLeftarrow{}{}\mRightarrow{} \mforall{}y:T. Q[y]) supposing S = T
Date html generated:
2016_05_13-PM-03_12_21
Last ObjectModification:
2016_01_06-PM-05_24_27
Theory : core_2
Home
Index