:: On a Mathematical Model of Programs
:: by Yatsuka Nakamura and Andrzej Trybulec
::
:: Received December 29, 1992
:: Copyright (c) 1992-2021 Association of Mizar Users
:: (Stowarzyszenie Uzytkownikow Mizara, Bialystok, Poland).
:: This code can be distributed under the GNU General Public Licence
:: version 3.0 or later, or the Creative Commons Attribution-ShareAlike
:: License version 3.0 or later, subject to the binding interpretation
:: detailed in file COPYING.interpretation.
:: See COPYING.GPL and COPYING.CC-BY-SA for the full text of these
:: licenses, or see http://www.gnu.org/licenses/gpl.html and
:: http://creativecommons.org/licenses/by-sa/3.0/.
environ
vocabularies NUMBERS, SUBSET_1, XBOOLE_0, CARD_1, ZFMISC_1, FINSEQ_1, FUNCT_1,
CARD_3, RELAT_1, AMI_1, NAT_1, FUNCT_4, FUNCOP_1, INT_1, ARYTM_3,
ARYTM_1, XXREAL_0, FUNCT_5, TARSKI, AMI_2, GROUP_9, PBOOLE, AFINSQ_1,
PARTFUN1, ORDINAL1;
notations TARSKI, XBOOLE_0, ZFMISC_1, XTUPLE_0, SUBSET_1, ORDINAL1, CARD_1,
PARTFUN1, NUMBERS, XCMPLX_0, CARD_3, RELAT_1, FUNCT_1, FUNCT_2, PBOOLE,
AFINSQ_1, XXREAL_0, BINOP_1, MCART_1, INT_1, FUNCOP_1, FUNCT_4, CAT_2,
FINSEQ_1, FUNCT_5, SCM_INST;
constructors DOMAIN_1, CAT_2, CARD_3, ABIAN, RELSET_1, AFINSQ_1, VALUED_1,
SCM_INST, FUNCT_5, XTUPLE_0, FUNCT_4, NUMBERS;
registrations XBOOLE_0, FUNCOP_1, NUMBERS, XXREAL_0, XREAL_0, INT_1, CARD_3,
FINSET_1, ORDINAL2, CARD_1, FUNCT_1, RELSET_1, FUNCT_2, AFINSQ_1,
SCM_INST, RELAT_1, PBOOLE;
requirements NUMERALS, SUBSET, BOOLE;
definitions FUNCT_1;
equalities TARSKI, FUNCOP_1, SCM_INST, ORDINAL1;
theorems ZFMISC_1, FUNCT_2, TARSKI, FUNCOP_1, ENUMSET1, INT_1, CARD_3,
FUNCT_4, XBOOLE_0, XBOOLE_1, ORDINAL1, RELAT_1, NUMBERS, CARD_1,
AFINSQ_1, PARTFUN1, FUNCT_1, FUNCT_5, XTUPLE_0;
schemes FUNCT_2, BINOP_1;
begin :: A small concrete machine
reserve x,y,z for set;
:: Na razie potrzebny w SCM_INST
::definition
:: func SCM-Data-Loc equals
:: [:{1},NAT:];
:: coherence;
::end;
definition
func SCM-Memory -> set equals
{NAT} \/ SCM-Data-Loc;
coherence;
end;
registration
cluster SCM-Memory -> non empty;
coherence;
end;
definition
redefine func SCM-Data-Loc -> Subset of SCM-Memory;
coherence by XBOOLE_1:7;
end;
::registration
:: cluster SCM-Data-Loc -> non empty;
:: coherence;
::end;
reserve I,J,K for Element of Segm 9,
i,a,a1,a2 for Nat,
b,b1,b2,c,c1 for Element of SCM-Data-Loc;
Lm1: now
let k be Element of SCM-Memory;
k in {NAT} or k in SCM-Data-Loc by XBOOLE_0:def 3;
hence k = NAT or k in SCM-Data-Loc by TARSKI:def 1;
end;
Lm2: not NAT in SCM-Data-Loc
proof
assume NAT in SCM-Data-Loc;
then NAT in [:{1},NAT:];
then ex x,y being object st NAT = [x,y] by RELAT_1:def 1;
hence contradiction;
end;
definition
::$CD 2
func SCM-OK -> Function of SCM-Memory, Segm 2 means
:Def2: for k being Element of SCM-Memory
holds (k = NAT implies it.k = 0) &
(k in SCM-Data-Loc implies it.k = 1);
existence
proof
defpred P[set,set] means
$1 = NAT & $2 = 0 or $1 in SCM-Data-Loc & $2 = 1;
A1: now
let k be Element of SCM-Memory;
A2: {0} \/ { 1 } = {0, 1} by ENUMSET1:1;
then
A3: 0 in {1} \/ { 0 } by TARSKI:def 2;
A4: P[k,0] or P[k,1] by Lm1;
1 in {1} \/ { 0 } by A2,TARSKI:def 2;
hence ex b being Element of Segm 2 st P[k,b] by A2,A3,A4,CARD_1:50;
end;
consider h being Function of SCM-Memory, Segm 2 such
that
A5: for a being Element of SCM-Memory holds P[a,h.a] from FUNCT_2:sch 3(A1);
take h;
let k be Element of SCM-Memory;
thus k = NAT implies h.k = 0 by A5,Lm2;
thus k in SCM-Data-Loc implies h.k = 1 by A5,Lm2;
thus thesis;
end;
uniqueness
proof
let f,g be Function of SCM-Memory, Segm 2 such that
A6: for k being Element of SCM-Memory holds
(k = NAT implies f.k = 0) & (k in SCM-Data-Loc implies f.k = 1)
and
A7: for k being Element of SCM-Memory holds
(k = NAT implies g.k = 0) & (k in SCM-Data-Loc implies g.k = 1);
now
let k be Element of SCM-Memory;
now
per cases by Lm1;
suppose
A8: k = NAT;
hence f.k = 0 by A6
.= g.k by A7,A8;
end;
suppose
A9: k in SCM-Data-Loc;
hence f.k = 1 by A6
.= g.k by A7,A9;
end;
end;
hence f.k = g.k;
end;
hence thesis by FUNCT_2:63;
end;
end;
::$CT
definition
func SCM-VAL -> ManySortedSet of Segm 2 equals
<%NAT,INT%>;
coherence;
end;
Lm3: NAT in SCM-Memory
proof
NAT in {NAT} by TARSKI:def 1;
hence thesis by XBOOLE_0:def 3;
end;
::$CT 4
theorem Th1:
(SCM-VAL*SCM-OK).NAT = NAT
proof
NAT in dom SCM-OK by Lm3,PARTFUN1:def 2;
then
A1: (SCM-VAL*SCM-OK).NAT = SCM-VAL.(SCM-OK.NAT) by FUNCT_1:13;
(SCM-VAL*SCM-OK).NAT = SCM-VAL.0 by A1,Def2,Lm3;
hence thesis;
end;
theorem Th2:
for i being Element of SCM-Memory
holds i in SCM-Data-Loc implies (SCM-VAL*SCM-OK).i = INT
proof
let i be Element of SCM-Memory;
i in SCM-Memory;
then i in dom SCM-OK by PARTFUN1:def 2;
then
A1: (SCM-VAL*SCM-OK).i = SCM-VAL.(SCM-OK.i) by FUNCT_1:13;
assume i in SCM-Data-Loc;
then (SCM-VAL*SCM-OK).i = SCM-VAL.1 by A1,Def2;
hence thesis;
end;
Lm4: dom SCM-OK = SCM-Memory by PARTFUN1:def 2;
len <%NAT,INT%> = 2 by AFINSQ_1:38;
then rng SCM-OK c= dom SCM-VAL by RELAT_1:def 19;
then
Lm5:
dom(SCM-VAL*SCM-OK) = SCM-Memory by Lm4,RELAT_1:27;
registration
cluster SCM-VAL*SCM-OK -> non-empty;
coherence
proof set F = SCM-VAL*SCM-OK;
let n be object;
assume
A1: n in dom F;
per cases by A1,Lm1,Lm5;
suppose n = NAT;
hence F.n is non empty by Th1;
end;
suppose n in SCM-Data-Loc;
hence F.n is non empty by Th2;
end;
end;
end;
definition
mode SCM-State is Element of product(SCM-VAL*SCM-OK);
end;
theorem
for a being Element of SCM-Data-Loc
holds (SCM-VAL*SCM-OK).a = INT by Th2;
theorem Th4:
pi(product(SCM-VAL*SCM-OK),NAT) = NAT by Th1,Lm5,Lm3,CARD_3:12;
theorem Th5:
for a being Element of SCM-Data-Loc
holds pi(product(SCM-VAL*SCM-OK),a) = INT
proof
let a be Element of SCM-Data-Loc;
thus pi(product(SCM-VAL*SCM-OK),a) = (SCM-VAL*SCM-OK).a by Lm5,CARD_3:12
.= INT by Th2;
end;
definition
let s be SCM-State;
func IC(s) -> Element of NAT equals
s.NAT;
coherence by Th4,CARD_3:def 6;
end;
definition
let s be SCM-State, u be natural Number;
func SCM-Chg(s,u) -> SCM-State equals
s +* (NAT .--> u);
coherence
proof
A1: now
let x be object;
assume
A2: x in dom(SCM-VAL*SCM-OK);
per cases;
suppose
A3: x = NAT;
NAT in dom(NAT .--> u) by TARSKI:def 1;
then (s +* (NAT .--> u)).NAT = (NAT .--> u).NAT by FUNCT_4:13
.= u by FUNCOP_1:72;
hence (s +* (NAT .--> u)).x in (SCM-VAL*SCM-OK).x
by A3,Th1,ORDINAL1:def 12;
end;
suppose
A4: x <> NAT;
not x in dom(NAT .--> u) by A4,TARSKI:def 1;
then (s +* (NAT .--> u)).x = s.x by FUNCT_4:11;
hence (s +* (NAT .--> u)).x in (SCM-VAL*SCM-OK).x by A2,CARD_3:9;
end;
end;
dom s = SCM-Memory by Lm5,CARD_3:9;
then dom(s +* (NAT .--> u)) = SCM-Memory \/ dom(NAT .--> u) by
FUNCT_4:def 1
.= SCM-Memory \/ {NAT}
.= dom(SCM-VAL*SCM-OK) by Lm5,Lm3,ZFMISC_1:40;
hence thesis by A1,CARD_3:9;
end;
end;
theorem
for s being SCM-State, u being natural Number holds SCM-Chg(s,u).NAT = u
proof
let s be SCM-State, u be natural Number;
NAT in dom(NAT .--> u) by TARSKI:def 1;
hence SCM-Chg(s,u).NAT = (NAT .--> u).NAT by FUNCT_4:13
.= u by FUNCOP_1:72;
end;
theorem
for s being SCM-State, u being natural Number,
mk being Element of SCM-Data-Loc holds SCM-Chg(s,u).mk = s.mk
proof
let s be SCM-State, u be natural Number, mk be Element of SCM-Data-Loc;
(SCM-VAL*SCM-OK).NAT = NAT & (SCM-VAL*SCM-OK).mk = INT by Th1,Th2;
then not mk in dom(NAT .--> u) by NUMBERS:7,TARSKI:def 1;
hence thesis by FUNCT_4:11;
end;
theorem
for s being SCM-State, u,v being natural Number holds SCM-Chg(s,u).v = s.v
proof
let s be SCM-State, u,v be natural Number;
not v in dom(NAT .--> u) by TARSKI:def 1;
hence thesis by FUNCT_4:11;
end;
definition
let s be SCM-State, t be Element of SCM-Data-Loc, u be Integer;
func SCM-Chg(s,t,u) -> SCM-State equals
s +* (t .--> u);
coherence
proof
A1: now
let x be object;
assume
A2: x in dom(SCM-VAL*SCM-OK);
per cases;
suppose
A3: x = t;
t in dom(t .--> u) by TARSKI:def 1;
then (s +* (t .--> u)).t = (t .--> u).t by FUNCT_4:13
.= u by FUNCOP_1:72;
then (s +* (t .--> u)).t in INT by INT_1:def 2;
hence (s +* (t .--> u)).x in (SCM-VAL*SCM-OK).x by A3,Th2;
end;
suppose
A4: x <> t;
not x in dom(t .--> u) by A4,TARSKI:def 1;
then (s +* (t .--> u)).x = s.x by FUNCT_4:11;
hence (s +* (t .--> u)).x in (SCM-VAL*SCM-OK).x by A2,CARD_3:9;
end;
end;
dom s = SCM-Memory by Lm5,CARD_3:9;
then dom(s +* (t .--> u)) = SCM-Memory \/ dom(t .--> u) by FUNCT_4:def 1
.= SCM-Memory \/ {t}
.= dom(SCM-VAL*SCM-OK) by Lm5,ZFMISC_1:40;
hence thesis by A1,CARD_3:9;
end;
end;
theorem
for s being SCM-State, t being Element of SCM-Data-Loc, u being
Integer holds SCM-Chg(s,t,u).NAT = s.NAT
proof
let s be SCM-State, t be Element of SCM-Data-Loc, u be Integer;
(SCM-VAL*SCM-OK).NAT = NAT & (SCM-VAL*SCM-OK).t = INT by Th1,Th2;
then not NAT in dom(t .--> u) by NUMBERS:7,TARSKI:def 1;
hence thesis by FUNCT_4:11;
end;
theorem
for s being SCM-State, t being Element of SCM-Data-Loc, u being
Integer holds SCM-Chg(s,t,u).t = u
proof
let s be SCM-State, t be Element of SCM-Data-Loc, u be Integer;
t in dom(t .--> u) by TARSKI:def 1;
hence SCM-Chg(s,t,u).t = (t .--> u).t by FUNCT_4:13
.= u by FUNCOP_1:72;
end;
theorem
for s being SCM-State, t being Element of SCM-Data-Loc, u being
Integer, mk being Element of SCM-Data-Loc st mk <> t holds SCM-Chg(s,t,u).mk =
s.mk
proof
let s be SCM-State, t be Element of SCM-Data-Loc, u be Integer, mk be
Element of SCM-Data-Loc such that
A1: mk <> t;
not mk in dom(t .--> u) by A1,TARSKI:def 1;
hence thesis by FUNCT_4:11;
end;
registration
let s be SCM-State, a be Element of SCM-Data-Loc;
cluster s.a -> integer;
coherence
proof
s.a in pi(product(SCM-VAL*SCM-OK),a) by CARD_3:def 6;
then s.a in INT by Th5;
hence thesis;
end;
end;
registration
let x,y be ExtReal, a,b be Nat;
cluster IFGT(x,y,a,b) -> natural;
coherence;
end;
definition
::$CD 5
let x be Element of SCM-Instr, s be SCM-State;
func SCM-Exec-Res(x,s) -> SCM-State equals
SCM-Chg(SCM-Chg(s, x address_1,s.(x address_2)), IC s + 1)
if ex mk, ml being Element of SCM-Data-Loc st x = [1, {}, <*mk, ml*>],
SCM-Chg(SCM-Chg(s,x address_1, s.(x address_1)+s.(x address_2)),IC s + 1)
if ex mk, ml being Element of SCM-Data-Loc st x = [ 2, {}, <*mk, ml*>],
SCM-Chg(SCM-Chg(s,x address_1, s.(x address_1)-s.(x address_2)),IC s + 1)
if ex mk, ml being Element of SCM-Data-Loc st x = [ 3, {}, <*mk, ml*>],
SCM-Chg(SCM-Chg(s,x address_1, s.(x address_1)*s.(x address_2)),IC s + 1)
if ex mk, ml being Element of SCM-Data-Loc st x = [ 4, {}, <*mk, ml*>],
SCM-Chg(SCM-Chg( SCM-Chg(s,
x address_1, s.(x address_1) div s.(x address_2)),
x address_2, s.(x address_1) mod s.(x address_2)),IC s + 1)
if ex mk, ml being Element of SCM-Data-Loc st x = [ 5, {}, <*mk, ml*>],
SCM-Chg(s,x jump_address)
if ex mk being Nat st x = [ 6, <*mk*>, {}],
SCM-Chg(s,IFEQ(s.(x cond_address),0,x cjump_address,IC s + 1))
if ex mk being Nat, ml being Element of SCM-Data-Loc st
x = [7, <*mk*>, <*ml*>],
SCM-Chg(s,IFGT(s.(x cond_address),0,x cjump_address,IC s + 1))
if ex mk being Nat, ml being Element of SCM-Data-Loc st
x = [ 8, <*mk*>, <*ml*>]
otherwise s;
consistency by XTUPLE_0:3;
coherence;
end;
definition
func SCM-Exec -> Action of SCM-Instr, product(SCM-VAL*SCM-OK) means
for x being Element of SCM-Instr, y being SCM-State holds (it.x).y =
SCM-Exec-Res(x,y);
existence
proof
consider f being
Function of [:SCM-Instr,product(SCM-VAL*SCM-OK):], product(SCM-VAL*SCM-OK)
such that
A1: for x being Element of SCM-Instr, y being SCM-State holds f.(x,y)
= SCM-Exec-Res(x,y) from BINOP_1:sch 4;
take curry f;
let x be Element of SCM-Instr, y be SCM-State;
thus (curry f).x.y = f.(x,y) by FUNCT_5:69
.= SCM-Exec-Res(x,y) by A1;
end;
uniqueness
proof
let f,g be Action of SCM-Instr, product(SCM-VAL*SCM-OK) such that
A2: for x being Element of SCM-Instr, y being SCM-State holds (f.x).y
= SCM-Exec-Res(x,y) and
A3: for x being Element of SCM-Instr, y being SCM-State holds (g.x).y
= SCM-Exec-Res(x,y);
now
let x be Element of SCM-Instr;
reconsider gx=g.x, fx=f.x
as Function of product(SCM-VAL*SCM-OK), product(SCM-VAL*SCM-OK)
by FUNCT_2:66;
now
let y be SCM-State;
thus fx.y = SCM-Exec-Res(x,y) by A2
.= gx.y by A3;
end;
hence f.x = g.x by FUNCT_2:63;
end;
hence f = g by FUNCT_2:63;
end;
end;
begin :: Addenda
:: missing, 2007.07.27, A.T.
::$CT 3
theorem
not NAT in SCM-Data-Loc by Lm2;
::$CT
theorem
NAT in SCM-Memory by Lm3;
theorem
x in SCM-Data-Loc implies ex k being Nat st x = [1,k]
proof
assume x in SCM-Data-Loc;
then consider y,z being object such that
A1: y in {1} and
A2: z in NAT and
A3: x = [y,z] by ZFMISC_1:84;
reconsider k = z as Nat by A2;
take k;
thus thesis by A1,A3,TARSKI:def 1;
end;
theorem
for k being Nat holds [1,k] in SCM-Data-Loc
proof
let k be Nat;
1 in {1} & k in NAT by ORDINAL1:def 12,TARSKI:def 1;
hence thesis by ZFMISC_1:87;
end;
::$CT
theorem
for k being Element of SCM-Memory
holds k = NAT or k in SCM-Data-Loc by Lm1;
theorem
dom(SCM-VAL*SCM-OK) = SCM-Memory by Lm5;
theorem
for s being SCM-State holds dom s = SCM-Memory by Lm5,CARD_3:9;
definition let x be set;
attr x is Int-like means
x in SCM-Data-Loc;
end;
theorem
for S being SCM-State holds
S is total (SCM-Memory)-defined Function;