Nuprl Lemma : sym_functionality_wrt_iff
∀[T:Type]. ∀[R,R':T ⟶ T ⟶ ℙ]. ((∀x,y:T. (R[x;y]
⇐⇒ R'[x;y]))
⇒ (Sym(T;x,y.R[x;y])
⇐⇒ Sym(T;x,y.R'[x;y])))
Proof
Definitions occuring in Statement :
sym: Sym(T;x,y.E[x; y])
,
uall: ∀[x:A]. B[x]
,
prop: ℙ
,
so_apply: x[s1;s2]
,
all: ∀x:A. B[x]
,
iff: P
⇐⇒ Q
,
implies: P
⇒ Q
,
function: x:A ⟶ B[x]
,
universe: Type
Definitions unfolded in proof :
sym: Sym(T;x,y.E[x; y])
,
uall: ∀[x:A]. B[x]
,
implies: P
⇒ Q
,
iff: P
⇐⇒ Q
,
and: P ∧ Q
,
all: ∀x:A. B[x]
,
member: t ∈ T
,
prop: ℙ
,
so_apply: x[s1;s2]
,
so_lambda: λ2x.t[x]
,
so_apply: x[s]
,
rev_implies: P
⇐ Q
,
guard: {T}
Lemmas referenced :
all_wf,
iff_wf
Rules used in proof :
sqequalSubstitution,
sqequalRule,
sqequalReflexivity,
sqequalTransitivity,
computationStep,
isect_memberFormation,
lambdaFormation,
independent_pairFormation,
cut,
hypothesis,
sqequalHypSubstitution,
dependent_functionElimination,
thin,
hypothesisEquality,
productElimination,
independent_functionElimination,
applyEquality,
lemma_by_obid,
isectElimination,
lambdaEquality,
functionEquality,
cumulativity,
universeEquality
Latex:
\mforall{}[T:Type]. \mforall{}[R,R':T {}\mrightarrow{} T {}\mrightarrow{} \mBbbP{}].
((\mforall{}x,y:T. (R[x;y] \mLeftarrow{}{}\mRightarrow{} R'[x;y])) {}\mRightarrow{} (Sym(T;x,y.R[x;y]) \mLeftarrow{}{}\mRightarrow{} Sym(T;x,y.R'[x;y])))
Date html generated:
2016_05_13-PM-04_14_43
Last ObjectModification:
2015_12_26-AM-11_30_16
Theory : rel_1
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