Nuprl Lemma : neg_inv_fps
∀[X:Type]. ∀[r:CRng]. ∀[a:PowerSeries(X;r)]. (-(-(a)) = a ∈ PowerSeries(X;r))
Proof
Definitions occuring in Statement :
fps-neg: -(f),
power-series: PowerSeries(X;r),
uall: ∀[x:A]. B[x],
universe: Type,
equal: s = t ∈ T,
crng: CRng
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
fps-neg: -(f),
power-series: PowerSeries(X;r),
squash: ↓T,
prop: ℙ,
crng: CRng,
rng: Rng,
true: True,
subtype_rel: A ⊆r B,
uimplies: b supposing a,
guard: {T},
iff: P ⇐⇒ Q,
and: P ∧ Q,
rev_implies: P ⇐ Q,
implies: P ⇒ Q
Lemmas referenced :
equal_wf,
squash_wf,
true_wf,
rng_car_wf,
rng_minus_minus,
iff_weakening_equal,
bag_wf,
power-series_wf,
crng_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalRule,
functionExtensionality,
applyEquality,
thin,
lambdaEquality,
sqequalHypSubstitution,
imageElimination,
extract_by_obid,
isectElimination,
hypothesisEquality,
equalityTransitivity,
hypothesis,
equalitySymmetry,
because_Cache,
setElimination,
rename,
natural_numberEquality,
imageMemberEquality,
baseClosed,
universeEquality,
independent_isectElimination,
productElimination,
independent_functionElimination,
cumulativity,
isect_memberEquality,
axiomEquality
Latex:
\mforall{}[X:Type]. \mforall{}[r:CRng]. \mforall{}[a:PowerSeries(X;r)]. (-(-(a)) = a)
Date html generated:
2018_05_21-PM-09_56_39
Last ObjectModification:
2017_07_26-PM-06_33_02
Theory : power!series
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