Nuprl Lemma : pv11_p1_decision_from_maj_acceptors
∀Cmd:ValueAllType. ∀f:pv11_p1_headers_type{i:l}(Cmd). ∀es:EO+(Message(f)). ∀e:E. ∀accpts,ldrs:bag(Id).
∀ldrs_uid:Id ⟶ ℤ. ∀reps:bag(Id). ∀b:pv11_p1_Ballot_Num(). ∀s:ℤ. ∀c:Cmd. ∀i:Id.
(Inj(Id;ℤ;ldrs_uid)
⇒ pv11_p1_message-constraint{paxos-v11-part1.esh:o}(Cmd; accpts; ldrs; ldrs_uid; reps; f; es)
⇒ 0 < #(accpts)
⇒ has-es-info-type(es;e;f;Id × pv11_p1_Ballot_Num() × ℤ × pv11_p1_Ballot_Num())
⇒ (b = (snd(snd(snd(msgval(e))))) ∈ pv11_p1_Ballot_Num())
⇒ pv11_p1_decision'send(Cmd;f) i <s, c> ∈ pv11_p1_main(Cmd;accpts;ldrs;ldrs_uid;reps;f)(e)
⇒ (↓∃L:E List
(#([i∈accpts|¬bi ∈b map(λe.loc(e);L)]) < pv11_p1_threshold(accpts)
∧ (∀e':E
((e' ∈ L)
⇒ ((e' < e)
∧ loc(e') ↓∈ accpts
∧ (b = (fst(pv11_p1_AcceptorStateFun(Cmd;ldrs_uid;f;es;e'))) ∈ pv11_p1_Ballot_Num())
∧ (<b, s, c> ∈ snd(pv11_p1_AcceptorStateFun(Cmd;ldrs_uid;f;es;e')))))))))
Proof
Definitions occuring in Statement :
pv11_p1_decision'send: pv11_p1_decision'send(Cmd;f)
,
pv11_p1_message-constraint: pv11_p1_message-constraint{paxos-v11-part1.esh:o}(Cmd; accpts; ldrs; ldrs_uid; reps; mf; es)
,
pv11_p1_main: pv11_p1_main(Cmd;accpts;ldrs;ldrs_uid;reps;mf)
,
pv11_p1_AcceptorStateFun: pv11_p1_AcceptorStateFun(Cmd;ldrs_uid;mf;es;e)
,
pv11_p1_threshold: pv11_p1_threshold(accpts)
,
pv11_p1_headers_type: pv11_p1_headers_type{i:l}(Cmd)
,
pv11_p1_Ballot_Num: pv11_p1_Ballot_Num()
,
msg-interface: Interface
,
es-info-body: msgval(e)
,
has-es-info-type: has-es-info-type(es;e;f;T)
,
Message: Message(f)
,
classrel: v ∈ X(e)
,
event-ordering+: EO+(Info)
,
es-causl: (e < e')
,
es-loc: loc(e)
,
es-E: E
,
id-deq: IdDeq
,
Id: Id
,
l_member: (x ∈ l)
,
deq-member: x ∈b L
,
map: map(f;as)
,
list: T List
,
inject: Inj(A;B;f)
,
vatype: ValueAllType
,
bnot: ¬bb
,
less_than: a < b
,
pi1: fst(t)
,
pi2: snd(t)
,
all: ∀x:A. B[x]
,
exists: ∃x:A. B[x]
,
squash: ↓T
,
implies: P
⇒ Q
,
and: P ∧ Q
,
apply: f a
,
lambda: λx.A[x]
,
function: x:A ⟶ B[x]
,
pair: <a, b>
,
product: x:A × B[x]
,
natural_number: $n
,
int: ℤ
,
equal: s = t ∈ T
,
bag-member: x ↓∈ bs
,
bag-size: #(bs)
,
bag-filter: [x∈b|p[x]]
,
bag: bag(T)
Definitions unfolded in proof :
vatype: ValueAllType
,
all: ∀x:A. B[x]
,
implies: P
⇒ Q
,
pv11_p1_headers_type: pv11_p1_headers_type{i:l}(Cmd)
,
l_all: (∀x∈L.P[x])
,
and: P ∧ Q
,
member: t ∈ T
,
uall: ∀[x:A]. B[x]
,
so_lambda: λ2x.t[x]
,
subtype_rel: A ⊆r B
,
prop: ℙ
,
so_apply: x[s]
,
iff: P
⇐⇒ Q
,
listp: A List+
,
name: Name
,
int_seg: {i..j-}
,
lelt: i ≤ j < k
,
le: A ≤ B
,
less_than': less_than'(a;b)
,
false: False
,
not: ¬A
,
less_than: a < b
,
squash: ↓T
,
length: ||as||
,
list_ind: list_ind,
pv11_p1_headers: pv11_p1_headers()
,
cons: [a / b]
,
nil: []
,
it: ⋅
,
true: True
,
select: L[n]
,
subtract: n - m
,
uimplies: b supposing a
,
guard: {T}
,
rev_implies: P
⇐ Q
,
pv11_p1_headers_fun: pv11_p1_headers_fun(Cmd)
,
name_eq: name_eq(x;y)
,
name-deq: NameDeq
,
list-deq: list-deq(eq)
,
band: p ∧b q
,
ifthenelse: if b then t else f fi
,
atom-deq: AtomDeq
,
eq_atom: x =a y
,
bfalse: ff
,
btrue: tt
,
null: null(as)
,
has-es-info-type: has-es-info-type(es;e;f;T)
,
pi2: snd(t)
,
nat: ℕ
,
pv11_p1_decision'send: pv11_p1_decision'send(Cmd;f)
,
make-Msg: make-Msg(hdr;val)
,
mk-msg-interface: mk-msg-interface(l;m)
,
make-msg-interface: make-msg-interface(i;l;m)
,
mk-msg: mk-msg(auth;hdr;val)
,
exists: ∃x:A. B[x]
,
pv11_p1_p2a'send: pv11_p1_p2a'send(Cmd;f)
,
cand: A c∧ B
,
sq_type: SQType(T)
,
pv11_p1_Ballot_Num: pv11_p1_Ballot_Num()
,
Id: Id
,
pi1: fst(t)
,
top: Top
Latex:
\mforall{}Cmd:ValueAllType. \mforall{}f:pv11\_p1\_headers\_type\{i:l\}(Cmd). \mforall{}es:EO+(Message(f)). \mforall{}e:E.
\mforall{}accpts,ldrs:bag(Id). \mforall{}ldrs$_{uid}$:Id {}\mrightarrow{} \mBbbZ{}. \mforall{}reps:bag(Id). \mforall{}b:pv11\_p1\_Ballot\_Nu\000Cm(). \mforall{}s:\mBbbZ{}. \mforall{}c:Cmd. \mforall{}i:Id.
(Inj(Id;\mBbbZ{};ldrs$_{uid}$)
{}\mRightarrow{} pv11\_p1\_message-constraint\{paxos-v11-part1.esh:o\}(Cmd; accpts; ldrs; ldrs$_{uid\mbackslash{}ff7\000Cd$; reps; f; es)
{}\mRightarrow{} 0 < \#(accpts)
{}\mRightarrow{} has-es-info-type(es;e;f;Id \mtimes{} pv11\_p1\_Ballot\_Num() \mtimes{} \mBbbZ{} \mtimes{} pv11\_p1\_Ballot\_Num())
{}\mRightarrow{} (b = (snd(snd(snd(msgval(e))))))
{}\mRightarrow{} pv11\_p1\_decision'send(Cmd;f) i <s, c> \mmember{} pv11\_p1\_main(Cmd;accpts;ldrs;ldrs$_{uid\mbackslash{}ff7\000Cd$;reps;f)(e)
{}\mRightarrow{} (\mdownarrow{}\mexists{}L:E List
(\#([i\mmember{}accpts|\mneg{}\msubb{}i \mmember{}\msubb{} map(\mlambda{}e.loc(e);L)]) < pv11\_p1\_threshold(accpts)
\mwedge{} (\mforall{}e':E
((e' \mmember{} L)
{}\mRightarrow{} ((e' < e)
\mwedge{} loc(e') \mdownarrow{}\mmember{} accpts
\mwedge{} (b = (fst(pv11\_p1\_AcceptorStateFun(Cmd;ldrs$_{uid}$;f;es;e')))\000C)
\mwedge{} (<b, s, c> \mmember{} snd(pv11\_p1\_AcceptorStateFun(Cmd;ldrs$_{uid}$;f;e\000Cs;e')))))))))
Date html generated:
2016_05_17-PM-04_09_04
Last ObjectModification:
2016_01_18-AM-11_15_33
Theory : paxos!synod
Home
Index