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R0002-01509 · q-20261013-advance-20261020-r01-discrete-dynamical-system-0059
Use the complete finite self-map on Fin(7)={0,…,6} given by T(x)=(a*x+b) mod 7, a=4, b=17. Choose the least nonnegative residue, including for negative a*x+b. Time is discrete, indexed from 0; a finite orbit is not a general stability result. Give (modulus, a, b, every x with T(x)=x in increasing order).
G001 — Use the complete finite self-map on Fin(7)={0,…,6} given by T(x)=(a*x+b) mod 7, a=4, b=17. Choose the least nonnegative residue, including for negative a*x+b. Time is discrete, indexed from 0; a finite orbit is not a general stability result. Give (modulus, a, b, every x with T(x)=x in increasing order).Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.
Before
X={0 through 6}; T(x)=(4x+(17)) mod 7After
remainder representative always lies in X
Conditions: none
Fix the full finite state carrier and the same update rule;negative integers also use the standard remainder from0 through n−1.
Rule: finite_total_map · Uses: G001
Before
candidate0: a·x := mul(4, 0)
After
candidate0: a·x = 0
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S001
Before
candidate0: a·x+b := sum(0, 17)
After
candidate0: a·x+b = 17
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S002
Before
reduce 17 modulo 7
After
17=2·7+3
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S003
Before
T(0)=3
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S004
Before
candidate1: a·x := mul(4, 1)
After
candidate1: a·x = 4
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S005
Before
candidate1: a·x+b := sum(4, 17)
After
candidate1: a·x+b = 21
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S006
Before
reduce 21 modulo 7
After
21=3·7+0
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S007
Before
T(1)=0
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S008
Before
candidate2: a·x := mul(4, 2)
After
candidate2: a·x = 8
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S009
Before
candidate2: a·x+b := sum(8, 17)
After
candidate2: a·x+b = 25
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S010
Before
reduce 25 modulo 7
After
25=3·7+4
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S011
Before
T(2)=4
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S012
Before
candidate3: a·x := mul(4, 3)
After
candidate3: a·x = 12
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S013
Before
candidate3: a·x+b := sum(12, 17)
After
candidate3: a·x+b = 29
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S014
Before
reduce 29 modulo 7
After
29=4·7+1
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S015
Before
T(3)=1
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S016
Before
candidate4: a·x := mul(4, 4)
After
candidate4: a·x = 16
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S017
Before
candidate4: a·x+b := sum(16, 17)
After
candidate4: a·x+b = 33
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S018
Before
reduce 33 modulo 7
After
33=4·7+5
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S019
Before
T(4)=5
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S020
Before
candidate5: a·x := mul(4, 5)
After
candidate5: a·x = 20
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S021
Before
candidate5: a·x+b := sum(20, 17)
After
candidate5: a·x+b = 37
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S022
Before
reduce 37 modulo 7
After
37=5·7+2
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S023
Before
T(5)=2
After
fixed-point condition T(x)=x: No
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S024
Before
candidate6: a·x := mul(4, 6)
After
candidate6: a·x = 24
Conditions: none
Multiply the original coefficient by the current state;do not clip negative values to0.
Rule: exact_rational_arithmetic · Uses: G001, S025
Before
candidate6: a·x+b := sum(24, 17)
After
candidate6: a·x+b = 41
Conditions: none
Add the same offset before reducing modulo n.
Rule: exact_rational_arithmetic · Uses: G001, S026
Before
reduce 41 modulo 7
After
41=5·7+6
Conditions: none
The integer identity together with0≤remainder<n determines the next state.
Rule: euclidean_remainder · Uses: G001, S027
Before
T(6)=6
After
fixed-point condition T(x)=x: Yes
Conditions: none
A fixed point must remain the same state after updating;merely remaining in the carrier is insufficient.
Rule: fixed_point_equality · Uses: G001, S028
Before
all 7 carrier elements audited
After
complete fixed set=[6]
Conditions: none
The full finite carrier was exhausted,so no fixed point is omitted;an empty list means this T has none.
Rule: exhaustive_fixed_inventory · Uses: G001, S029
S030 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S029 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S028 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S027 · premise_and_result_audit — Recompute candidate6: a·x+b with exact rational arithmetic, not rounded decimals.S026 · premise_and_result_audit — Recompute candidate6: a·x with exact rational arithmetic, not rounded decimals.S025 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S024 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S023 · premise_and_result_audit — Recompute candidate5: a·x+b with exact rational arithmetic, not rounded decimals.S022 · premise_and_result_audit — Recompute candidate5: a·x with exact rational arithmetic, not rounded decimals.S021 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S020 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S019 · premise_and_result_audit — Recompute candidate4: a·x+b with exact rational arithmetic, not rounded decimals.S018 · premise_and_result_audit — Recompute candidate4: a·x with exact rational arithmetic, not rounded decimals.S017 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S016 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S015 · premise_and_result_audit — Recompute candidate3: a·x+b with exact rational arithmetic, not rounded decimals.S014 · premise_and_result_audit — Recompute candidate3: a·x with exact rational arithmetic, not rounded decimals.S013 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S012 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S011 · premise_and_result_audit — Recompute candidate2: a·x+b with exact rational arithmetic, not rounded decimals.S010 · premise_and_result_audit — Recompute candidate2: a·x with exact rational arithmetic, not rounded decimals.S009 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S008 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S007 · premise_and_result_audit — Recompute candidate1: a·x+b with exact rational arithmetic, not rounded decimals.S006 · premise_and_result_audit — Recompute candidate1: a·x with exact rational arithmetic, not rounded decimals.S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.S003 · premise_and_result_audit — Recompute candidate0: a·x+b with exact rational arithmetic, not rounded decimals.S002 · premise_and_result_audit — Recompute candidate0: a·x with exact rational arithmetic, not rounded decimals.S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.(7, 4, 17, [6])
The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.
Review date: 2026-10-26
Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.
input commit: 0f7be61e2c22317a4075561dc822c87d881a50dboriginal question SHA-256: 927d53984080ad74374b04e0000848b8c33c7e20f07b7f34c2ea9e871188e89fcandidate record SHA-256: 8290d0a3751fda5259352b958ea9a4c4fcf2ab72d40a589f07f9cad32e40d2e1semantic review receipt SHA-256: 340d74dcc6e37df6249594a0b79a9ee2af804337b7847478b3c1342af9722861question-first witness SHA-256: 9a06233d190d31a16f13fb03b6c3ceba4cbb748fff6c997941f66ab1888dcca8Lean: NOT_RUN · human review: NOT_PERFORMED