Explore related knowledge and questions →

Question 23285: An Epsilon-NFA Relation May Be Empty, Partial or Multivalued

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

Return to catalogue page 117

← Question derivation index · Original question batch

R0045-23285 · q-20261014-advance-20261111-r07-nondeterministic-finite-automaton-0010

Original question and givens

Use the complete finite epsilon-NFA: states=[s9, m9, f9, d9], alphabet=[a9, b9], start=s9, final_states=[f9], transitions=[[s9, null, m9], [s9, null, d9], [m9, a9, m9], [m9, b9, f9]]. Transitions are [from,input symbol or null,to]; null is epsilon and consumes no input. States are nonempty because the start belongs to them, but alphabet/final sets and the transition relation may be empty. The relation may be multivalued, not deterministic or total. A configuration is [state,input position]; acceptance requires one finite path consuming the entire input and ending final. Give (states, alphabet, start, final_states, transitions, empty_target_rows, qualified, convention).

  • G001 — Use the complete finite epsilon-NFA: states=[s9, m9, f9, d9], alphabet=[a9, b9], start=s9, final_states=[f9], transitions=[[s9, null, m9], [s9, null, d9], [m9, a9, m9], [m9, b9, f9]]. Transitions are [from,input symbol or null,to]; null is epsilon and consumes no input. States are nonempty because the start belongs to them, but alphabet/final sets and the transition relation may be empty. The relation may be multivalued, not deterministic or total. A configuration is [state,input position]; acceptance requires one finite path consuming the entire input and ending final. Give (states, alphabet, start, final_states, transitions, empty_target_rows, qualified, convention).

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 operation=nfa-qualification;original snapshot and mathematics retained

After

explicit ordered source output fields=[states, alphabet, start, final_states, transitions, empty_target_rows, qualified, convention]

Conditions: none

Retain the historical interface marker while listing source fields without JavaScript.Tags and No retain their claim scope;source-protocol ordering is not a mathematical proof.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · implies

Before

ORIGINAL transition index=0;[from,input_or_null,to]=[s9, null, m9];state carrier=[s9, m9, f9, d9];alphabet=[a9, b9]

After

state endpoints legal;symbol either declared input or null EPS consuming0;ORIGINAL row position retained,including duplicate rows

Conditions: none

This is a relation,not a total single-valued function.Retain duplicate,multivalued and missing edges;null consumes0 and is not an alphabet string.

Step identifiers and dependencies

Rule: nfa_EVERY_original_relation_row_roles_empty_multi_EPS_legal · Uses: G001, S001

S003 · implies

Before

ORIGINAL transition index=1;[from,input_or_null,to]=[s9, null, d9];state carrier=[s9, m9, f9, d9];alphabet=[a9, b9]

After

state endpoints legal;symbol either declared input or null EPS consuming0;ORIGINAL row position retained,including duplicate rows

Conditions: none

This is a relation,not a total single-valued function.Retain duplicate,multivalued and missing edges;null consumes0 and is not an alphabet string.

Step identifiers and dependencies

Rule: nfa_EVERY_original_relation_row_roles_empty_multi_EPS_legal · Uses: G001, S002

S004 · implies

Before

ORIGINAL transition index=2;[from,input_or_null,to]=[m9, a9, m9];state carrier=[s9, m9, f9, d9];alphabet=[a9, b9]

After

state endpoints legal;symbol either declared input or null EPS consuming0;ORIGINAL row position retained,including duplicate rows

Conditions: none

This is a relation,not a total single-valued function.Retain duplicate,multivalued and missing edges;null consumes0 and is not an alphabet string.

Step identifiers and dependencies

Rule: nfa_EVERY_original_relation_row_roles_empty_multi_EPS_legal · Uses: G001, S003

S005 · implies

Before

ORIGINAL transition index=3;[from,input_or_null,to]=[m9, b9, f9];state carrier=[s9, m9, f9, d9];alphabet=[a9, b9]

After

state endpoints legal;symbol either declared input or null EPS consuming0;ORIGINAL row position retained,including duplicate rows

Conditions: none

This is a relation,not a total single-valued function.Retain duplicate,multivalued and missing edges;null consumes0 and is not an alphabet string.

Step identifiers and dependencies

Rule: nfa_EVERY_original_relation_row_roles_empty_multi_EPS_legal · Uses: G001, S004

S006 · implies

Before

ORIGINAL states=[s9, m9, f9, d9],alphabet=[a9, b9],start=s9,final_states=[f9];complete relation=[[s9, null, m9], [s9, null, d9], [m9, a9, m9], [m9, b9, f9]]

After

states nonempty with actual start;alphabet/final set/relation MAY be EMPTY;definition qualification does NOT prove determinism,totality,DFA equivalence or a successful run

Conditions: none

An empty final set is legal and recognizes the empty language;an empty alphabet is legal too.A qualified definition supplies no accepting path,determinism or DFA-equivalence proof.

Step identifiers and dependencies

Rule: nfa_qualified_definition_EMPTY_alphabet_finals_edges_allowed · Uses: G001, S005

S007 · implies

Before

ORIGINAL state order=[s9, m9, f9, d9];ORIGINAL alphabet order=[a9, b9];complete relation=[[s9, null, m9], [s9, null, d9], [m9, a9, m9], [m9, b9, f9]]

After

ALL [state,symbol,ORIGINAL-order targets] rows=[[s9, a9, []], [s9, b9, []], [m9, a9, [m9]], [m9, b9, [f9]], [f9, a9, []], [f9, b9, []], [d9, a9, []], [d9, b9, []]];EMPTY target rows=[[s9, a9, []], [s9, b9, []], [f9, a9, []], [f9, b9, []], [d9, a9, []], [d9, b9, []]];no missing edge repaired

Conditions: none

List all targets in original state/symbol order,retaining transition order and duplicates.Empty targets are legal;an empty alphabet has no such pairs,and an empty final set does not become accepting.

Step identifiers and dependencies

Rule: nfa_ORIGINAL_state_symbol_relation_targets_not_totality_assumption · Uses: G001, S006

Reverse checks

  • S007 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S002 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([s9, m9, f9, d9], [a9, b9], s9, [f9], [[s9, null, m9], [s9, null, d9], [m9, a9, m9], [m9, b9, f9]], [[s9, a9, []], [s9, b9, []], [f9, a9, []], [f9, b9, []], [d9, a9, []], [d9, b9, []]], Yes, transition_relation_may_be_empty_multi_valued_and_epsilon_enabled)

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: 1152cdfc72c2345ffc334b4f9c39ea23d4171b3a1776ad51850bb027b01d72ae
  • candidate record SHA-256: 6a32290299618b2250ee3fbe93f176437b5811b3fab771c01aa9e0a5d5ccc68e
  • semantic review receipt SHA-256: 357d7ad7a6726b2a757558d3b9586a408ade06526cc023da093719c292704438
  • question-first witness SHA-256: 99cefe17e98c7a74321801cf72df6d02fc95b6a6b78aa335accb7e11ed467b2a
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON