PC0004

prime_bit_prefix_entry

Every decoded mask entry has the exact primality indicator, independently of beta-code choice.

Alpha v34 checked-use · first admitted v27 · independently kernel and Lean verified; not Stable

Current library: Alpha v34, 4,223 checked-use theorems; Stable remains 432. Historical first admissions, original proof editions, and non-admitted aliases are preserved. Exact original first-admission records.

These are the exact finite integer inequalities with constant 8, for every N≥2. The proof uses constructive binomial and primorial infrastructure; it does not assume logarithms, asymptotic estimates, the prime number theorem, or a factorization oracle.

Exact theorem in conservative defined notation

∀ b. ∀ c. ∀ l. ∀ i. ∀ e. PrimeBitPrefix(b,c,l) → Lt(i,l) → BetaAt(b,c,i,e) → Prime(S i) ∧ e = 1 ∨ ¬Prime(S i) ∧ e = 0

Every linked abbreviation expands hygienically to the identical original native formula.

Definition DAG

PrimeBitPrefix(b,c,l) · 1Lt(a,b) · 1Prime(p) · 4BetaAt(b,c,i,x) · 2

Actual proof prerequisites

beta_at_unique · checked external prerequisite
Original expanded first-order statement 
forall b c l i e. (forall pc_index_mask_entry_source. (exists pc_lt_mask_entry_source_bound. pc_lt_mask_entry_source_bound + S (pc_index_mask_entry_source) = (l)) -> exists pc_bit_mask_entry_source. (((exists fs_h_pc_mask_entry_source_entry. fs_h_pc_mask_entry_source_entry + S (pc_bit_mask_entry_source) = S ((S (pc_index_mask_entry_source)) * c)) /\ exists fs_q_pc_mask_entry_source_entry. b = fs_q_pc_mask_entry_source_entry * S ((S (pc_index_mask_entry_source)) * c) + (pc_bit_mask_entry_source))) /\ (((((~(S (pc_index_mask_entry_source) = 1) /\ forall bpr_left_pc_mask_entry_source_choice_prime bpr_right_pc_mask_entry_source_choice_prime. S (pc_index_mask_entry_source) = bpr_left_pc_mask_entry_source_choice_prime * bpr_right_pc_mask_entry_source_choice_prime -> bpr_left_pc_mask_entry_source_choice_prime = 1 \/ bpr_right_pc_mask_entry_source_choice_prime = 1)) /\ pc_bit_mask_entry_source = 1) \/ (~((~(S (pc_index_mask_entry_source) = 1) /\ forall bpr_left_pc_mask_entry_source_choice_prime bpr_right_pc_mask_entry_source_choice_prime. S (pc_index_mask_entry_source) = bpr_left_pc_mask_entry_source_choice_prime * bpr_right_pc_mask_entry_source_choice_prime -> bpr_left_pc_mask_entry_source_choice_prime = 1 \/ bpr_right_pc_mask_entry_source_choice_prime = 1)) /\ pc_bit_mask_entry_source = 0)))) -> (exists pc_lt_mask_entry_bound. pc_lt_mask_entry_bound + S (i) = (l)) -> (((exists fs_h_pc_mask_entry_given. fs_h_pc_mask_entry_given + S (e) = S ((S (i)) * c)) /\ exists fs_q_pc_mask_entry_given. b = fs_q_pc_mask_entry_given * S ((S (i)) * c) + (e))) -> (((((~(S (i) = 1) /\ forall bpr_left_pc_mask_entry_choice_prime bpr_right_pc_mask_entry_choice_prime. S (i) = bpr_left_pc_mask_entry_choice_prime * bpr_right_pc_mask_entry_choice_prime -> bpr_left_pc_mask_entry_choice_prime = 1 \/ bpr_right_pc_mask_entry_choice_prime = 1)) /\ e = 1) \/ (~((~(S (i) = 1) /\ forall bpr_left_pc_mask_entry_choice_prime bpr_right_pc_mask_entry_choice_prime. S (i) = bpr_left_pc_mask_entry_choice_prime * bpr_right_pc_mask_entry_choice_prime -> bpr_left_pc_mask_entry_choice_prime = 1 \/ bpr_right_pc_mask_entry_choice_prime = 1)) /\ e = 0)))

Complete tactic proof in conservative notation

All 26 original proof lines are preserved. Only local proposition formulas are abbreviated; every abbreviation has an exact binder-safe expansion check. The linked exact edition contains the unchanged replay script.

Read the argument

Proof checkpoints

26 script commands · 6 reading checkpoints · 2 local claims

This is a reading aid, not a new proof or a proof-tree certificate. Checkpoint groups are consecutive commands, not inferred branch boundaries. Every step links to the preserved script.

Definition notation is shown below. Open the paired exact edition for the original native formulas. Source pairing is not a new equivalence certificate.

01Fix variables and assumptionsL1–8

Work with arbitrary variables or the premises of the current implication.

  1. L1
    intro b
  2. L2
    intro c
  3. L3
    intro l
  4. L4
    intro i
  5. L5
    intro e
  6. L6
    intro h
  7. L7
    intro hi
  8. L8
    intro he
02Establish hpL9–12

Establish this local claim before using it. It is not an additional assumption. The following proof commands apply h.

  1. L9
    have hp : ∃ a. BetaAt(b,c,i,a) ∧ (Prime(S i) ∧ a = 1 ∨ ¬Prime(S i) ∧ a = 0)Definitions: BetaAt(b,c,i,a)Prime(S i)Original native command in the exact edition
  2. L10
    specialize h i
  3. L11
    apply h
  4. L12
    exact hi
03Separate the logical casesL13–14

Follow the explicit conjunction, disjunction, witness, or contradiction step recorded below.

  1. L13
    cases hp
  2. L14
    cases hp_witness
04Establish heqL15–24

Establish this local claim before using it. It is not an additional assumption. The following proof commands apply beta at unique.

  1. L15
    have heq : x = e
  2. L16
    specialize beta_at_unique b
  3. L17
    specialize beta_at_unique c
  4. L18
    specialize beta_at_unique i
  5. L19
    specialize beta_at_unique x
  6. L20
    specialize beta_at_unique e
  7. L21
    apply beta_at_unique
  8. L22
    exact hp_witness_left
  9. L23
    exact he
  10. L24
    rewrite heq at hp_witness_right
05Calculate and transport equalitiesL25–25

Carry out the recorded arithmetic or equality steps; inspect the exact commands for their direction and premises.

  1. L25
    rewrite heq at hp_witness_right
06Use earlier factsL26–26

Instantiate or apply named facts and discharge the corresponding proof obligations.

  1. L26
    exact hp_witness_right

Library-wide reading audit

Original defined command ledger · 26 lines
  1. 0001intro b
  2. 0002intro c
  3. 0003intro l
  4. 0004intro i
  5. 0005intro e
  6. 0006intro h
  7. 0007intro hi
  8. 0008intro he
  9. 0009have hp : ∃ a. BetaAt(b,c,i,a) ∧ (Prime(S i) ∧ a = 1 ∨ ¬Prime(S i) ∧ a = 0)
  10. 0010specialize h i
  11. 0011apply h
  12. 0012exact hi
  13. 0013cases hp
  14. 0014cases hp_witness
  15. 0015have heq : x = e
  16. 0016specialize beta_at_unique b
  17. 0017specialize beta_at_unique c
  18. 0018specialize beta_at_unique i
  19. 0019specialize beta_at_unique x
  20. 0020specialize beta_at_unique e
  21. 0021apply beta_at_unique
  22. 0022exact hp_witness_left
  23. 0023exact he
  24. 0024rewrite heq at hp_witness_right
  25. 0025rewrite heq at hp_witness_right
  26. 0026exact hp_witness_right