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Question 35270: Total Vertex Degree in a Simple Undirected Graph

On this page
  1. Original question and givens
  2. Definition and scope
  3. Step-by-step derivation
  4. Reverse checks
  5. Result
  6. This question review and source binding

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R0069-35270 · q-20261003-advance-20261004-r04-graph-0095

Original question and givens

The finite simple undirected graph has V={7, 8, 9, 10, 11, 12} and E={{7, 8}, {8, 9}, {9, 10}, {10, 11}, {11, 12}}. There are no loops or multiple edges, and repeated representations of the same unordered edge count once. Find the sum of degrees over all vertices in V.

  • G001 — The finite simple undirected graph has V={7, 8, 9, 10, 11, 12} and E={{7, 8}, {8, 9}, {9, 10}, {10, 11}, {11, 12}}. There are no loops or multiple edges, and repeated representations of the same unordered edge count once. Find the sum of degrees over all vertices in V.

Definition and scope

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.

Step-by-step derivation

S001 · implies

Before

source roles = [qf-simple-graph-handshaking, [E, V, operation]]

After

derived = [handshaking, no-invented-domain]

Conditions: none

Keep EACH bank’s keys/operation/domain distinct:LDL/PULSE/function legacy table underscores,TREE full tree_* with its declared domain,and permissive BASE signed without invented op/domain.All arithmetic respects the binary-primitive contract.

Step identifiers and dependencies

Rule: R69_SOURCE_specific_keys_operation_domain_AND_binary_contract · Uses: G001

S002 · implies

Before

source roles = [LDL graph vertices ORIGINAL, 100, [7, 8, 9, 10, 11, 12]]

After

derived = [[7, 8, 9, 10, 11, 12]]

Conditions: none

Type EVERY RAW SAFE label,distinctness and THIS bank’s cardinality bound;empty is allowed.Sort ONLY the derived representation,not original JSON.Do not exchange TREE and LDL limits.

Step identifiers and dependencies

Rule: Finite_RAW_ALL_SAFE_distinct_labels_then_derived_sort · Uses: G001, S001

S003 · implies

Before

source roles = [LDL raw edges ORIGINAL, 0, [7, 8]]

After

derived = [[7, 8]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S002

S004 · implies

Before

source roles = [LDL raw edges ORIGINAL, 1, [8, 9]]

After

derived = [[8, 9]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S003

S005 · implies

Before

source roles = [LDL raw edges ORIGINAL, 2, [9, 10]]

After

derived = [[9, 10]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S004

S006 · implies

Before

source roles = [LDL raw edges ORIGINAL, 3, [10, 11]]

After

derived = [[10, 11]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S005

S007 · implies

Before

source roles = [LDL raw edges ORIGINAL, 4, [11, 12]]

After

derived = [[11, 12]]

Conditions: none

BEFORE deduplication,type EACH RAW pair as EXACTLY TWO SAFE components.Identical rows may be representation duplicates,but no unvalidated cell may be silently discarded.

Step identifiers and dependencies

Rule: Pairs_EVERY_RAW_two_SAFE_cells_BEFORE_any_dedup · Uses: G001, S006

S008 · implies

Before

source roles = [[7, 8, 9, 10, 11, 12], [[7, 8], [8, 9], [9, 10], [10, 11], [11, 12]], No]

After

derived = [[[7, 8], [8, 9], [9, 10], [10, 11], [11, 12]], [[7, [8]], [8, [7, 9]], [9, [8, 10]], [10, [9, 11]], [11, [10, 12]], [12, [11]]]]

Conditions: none

Type the WHOLE raw edge list,then normalize undirected endpoints/deduplicate;reversed duplicates are allowed.INPUT edges have no loops/outside endpoints,while isolated vertices stay in V.TREE raw E does NOT acquire LDL’s200-entry limit.

Step identifiers and dependencies

Rule: Graph_WHOLE_simple_undirected_edges_normalized_NO_loops_or_outside · Uses: G001, S007

S009 · implies

Before

source roles = [7, [8]]

After

derived = [1]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S008

S010 · implies

Before

source roles = [8, [7, 9]]

After

derived = [2]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S009

S011 · implies

Before

source roles = [9, [8, 10]]

After

derived = [2]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S010

S012 · implies

Before

source roles = [10, [9, 11]]

After

derived = [2]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S011

S013 · implies

Before

source roles = [11, [10, 12]]

After

derived = [2]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S012

S014 · implies

Before

source roles = [12, [11]]

After

derived = [1]

Conditions: none

For EVERY V vertex,count distinct neighbors;isolated degree is0.Include vertices absent from the edge list.

Step identifiers and dependencies

Rule: Graph_DEGREE_EACH_vertex_including_isolated · Uses: G001, S013

S015 · calculation

Before

Graph ORIGINAL all vertex degrees sum := sum(1, 2, 2, 2, 2, 1)

After

Graph ORIGINAL all vertex degrees sum = 10

Conditions: none

Use ORIGINAL operands exactly;mul/sub/div have EXPLICITLY TWO operands so the old binary primitive cannot ignore a third.Keep RAW SAFE bounds separate from unbounded derived BigInts;do not approximate to force answers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · calculation

Before

Graph ORIGINAL two endpoints per normalized edge := mul(2, 5)

After

Graph ORIGINAL two endpoints per normalized edge = 10

Conditions: none

Use ORIGINAL operands exactly;mul/sub/div have EXPLICITLY TWO operands so the old binary primitive cannot ignore a third.Keep RAW SAFE bounds separate from unbounded derived BigInts;do not approximate to force answers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S015

S017 · implies

Before

source roles = [[7, 8, 9, 10, 11, 12], [[7, 8], [8, 9], [9, 10], [10, 11], [11, 12]], [1, 2, 2, 2, 2, 1]]

After

derived = [10, 10]

Conditions: none

Every undirected edge contributes TWO endpoint incidences,so the COMPLETE degree sum is2|E|.For the empty graph both sides are0.This is finite full recomputation/double counting,not a sketch inference.

Step identifiers and dependencies

Rule: Graph_HANDSHAKE_complete_incidence_double_count · Uses: G001, S016

Reverse checks

  • S017 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S016 · premise_and_result_audit — Recompute Graph ORIGINAL two endpoints per normalized edge with exact rational arithmetic, not rounded decimals.
  • S015 · premise_and_result_audit — Recompute Graph ORIGINAL all vertex degrees sum with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S013 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S012 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S011 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S010 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S009 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S008 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S007 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S006 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S005 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S004 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S003 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S002 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.
  • S001 · premise_and_result_audit — Reverse-audit THIS question’s ORIGINAL data,types,roles,complete premises and field order.Do not invert implication or turn finite-table checks into infinite-domain/formal proof.Original Q/English/MKO/AST/status remain unchanged.

Result

10

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

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.

Source hashes and review receipts
  • input commit: 0f7be61e2c22317a4075561dc822c87d881a50db
  • original question SHA-256: bc894005a7e4125e4d1ae4263ac48cdc6d791945b372ffc825959e3ea2caae10
  • candidate record SHA-256: 6777edeeefd447b35974b05f1c85a78eebc96f56dd04d39157f78b664bb9441d
  • semantic review receipt SHA-256: ccf93c72638d6abf6a412514da5838d55ecb09b71d0e4fdec2b559dc9fdee14b
  • question-first witness SHA-256: 11af9a338b5a610342b2cfb2ee295683131b3139ac402dd19b1ba1725976d518
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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