PA004I · theorem

finite_bounded_last_succ

Stable checked-use theorem · independently closed

A bounded successor prefix exposes a bounded final decoded value.

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.

Statement with defined notation

∀ b. ∀ c. ∀ n. ∀ sn. sn = S n → BoundedPrefix(b,c,sn) → ∃ x. BetaAt(b,c,n,x)Lt(x,S n)

Every purple notation token opens its conservative definition. This is a reading surface; the compiler expands the statement before the unchanged kernel checks it.

Definitions used by this theorem

In the theorem statement

3 occurrences

In local proof propositions

none

0 occurrences

Exact expanded native-PA statement
forall b c n sn. sn = S n -> (forall fp_i_bounded_succ. (exists fp_gap_bounded_succ_index. fp_gap_bounded_succ_index + S fp_i_bounded_succ = sn) -> exists fp_value_bounded_succ. ((((exists ff_h_bounded_succ_entry. ff_h_bounded_succ_entry + S (fp_value_bounded_succ) = S ((S (fp_i_bounded_succ)) * c)) /\ exists ff_q_bounded_succ_entry. b = ff_q_bounded_succ_entry * S ((S (fp_i_bounded_succ)) * c) + (fp_value_bounded_succ))) /\ (exists fp_gap_bounded_succ_value. fp_gap_bounded_succ_value + S fp_value_bounded_succ = sn))) -> exists x. ((((exists ff_h_last_x. ff_h_last_x + S (x) = S ((S (n)) * c)) /\ exists ff_q_last_x. b = ff_q_last_x * S ((S (n)) * c) + (x))) /\ exists h. h + S x = S n)

Proof neighborhood

Direct theorem prerequisites

Direct theorem dependents

Definition-aware tactic body

Only local propositions introduced by have or suffices are compacted. The untrusted compiler re-expands each one before the original tactic script is replayed; defined notation is never accepted by the kernel. Open the exact replay line beneath every changed command.

Read the argument

Proof checkpoints

12 script commands · 3 reading checkpoints · 0 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.

Named ingredients (1)
01Fix variables and assumptionsL1–6

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

  1. L1
    intro b
  2. L2
    intro c
  3. L3
    intro n
  4. L4
    intro sn
  5. L5
    intro hsn
  6. L6
    intro hbounded
02Calculate and transport equalitiesL7–8

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

  1. L7
    rewrite hsn at hbounded
  2. L8
    rewrite hsn at hbounded
03Use earlier factsL9–12

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

  1. L9
    specialize hbounded n
  2. L10
    apply hbounded
  3. L11
    specialize le_refl (S n)
  4. L12
    exact le_refl

Library-wide reading audit

Original defined command ledger · 12 lines
  1. 0001intro b
  2. 0002intro c
  3. 0003intro n
  4. 0004intro sn
  5. 0005intro hsn
  6. 0006intro hbounded
  7. 0007rewrite hsn at hbounded
  8. 0008rewrite hsn at hbounded
  9. 0009specialize hbounded n
  10. 0010apply hbounded
  11. 0011specialize le_refl (S n)
  12. 0012exact le_refl