Nuprl Lemma : per-quot_elim
∀[T:Type]. ∀[E:T ⟶ T ⟶ ℙ].  (EquivRel(T;x,y.E[x;y]) 
⇒ (∀a,b:T.  (a = b ∈ (x,y:T/per/E[x;y]) 
⇐⇒ ↓E[a;b])))
Proof
Definitions occuring in Statement : 
per-quotient: x,y:T/per/E[x; y]
, 
equiv_rel: EquivRel(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
, 
squash: ↓T
, 
implies: P 
⇒ Q
, 
function: x:A ⟶ B[x]
, 
universe: Type
, 
equal: s = t ∈ T
Definitions unfolded in proof : 
per-quotient: x,y:T/per/E[x; y]
, 
quotient: x,y:A//B[x; y]
Lemmas referenced : 
quot_elim
Rules used in proof : 
cut, 
introduction, 
extract_by_obid, 
sqequalRule, 
sqequalReflexivity, 
sqequalSubstitution, 
sqequalTransitivity, 
computationStep, 
hypothesis
Latex:
\mforall{}[T:Type].  \mforall{}[E:T  {}\mrightarrow{}  T  {}\mrightarrow{}  \mBbbP{}].    (EquivRel(T;x,y.E[x;y])  {}\mRightarrow{}  (\mforall{}a,b:T.    (a  =  b  \mLeftarrow{}{}\mRightarrow{}  \mdownarrow{}E[a;b])))
Date html generated:
2019_06_20-PM-00_33_33
Last ObjectModification:
2018_08_21-PM-10_54_14
Theory : per-quotient
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