BT008E

beta_sum_zero

Stable ยท empty-context checked

The sum of an empty decoded prefix is zero.

Exact expanded PA statement

forall b c n. (exists fs_u_zero fs_v_zero. ((((exists fs_h_zero_body_start. fs_h_zero_body_start + S (0) = S ((S (0)) * fs_v_zero)) /\ exists fs_q_zero_body_start. fs_u_zero = fs_q_zero_body_start * S ((S (0)) * fs_v_zero) + (0))) /\ ((((exists fs_h_zero_body_terminal. fs_h_zero_body_terminal + S (n) = S ((S (0)) * fs_v_zero)) /\ exists fs_q_zero_body_terminal. fs_u_zero = fs_q_zero_body_terminal * S ((S (0)) * fs_v_zero) + (n))) /\ forall fs_i_zero_body_steps. (exists fs_lt_zero_body_steps_bound. fs_lt_zero_body_steps_bound + S fs_i_zero_body_steps = 0) -> exists fs_a_zero_body_steps fs_r_zero_body_steps fs_s_zero_body_steps. ((((exists fs_h_zero_body_steps_summand. fs_h_zero_body_steps_summand + S (fs_a_zero_body_steps) = S ((S (fs_i_zero_body_steps)) * c)) /\ exists fs_q_zero_body_steps_summand. b = fs_q_zero_body_steps_summand * S ((S (fs_i_zero_body_steps)) * c) + (fs_a_zero_body_steps))) /\ ((((exists fs_h_zero_body_steps_partial. fs_h_zero_body_steps_partial + S (fs_r_zero_body_steps) = S ((S (fs_i_zero_body_steps)) * fs_v_zero)) /\ exists fs_q_zero_body_steps_partial. fs_u_zero = fs_q_zero_body_steps_partial * S ((S (fs_i_zero_body_steps)) * fs_v_zero) + (fs_r_zero_body_steps))) /\ ((((exists fs_h_zero_body_steps_successor. fs_h_zero_body_steps_successor + S (fs_s_zero_body_steps) = S ((S (S fs_i_zero_body_steps)) * fs_v_zero)) /\ exists fs_q_zero_body_steps_successor. fs_u_zero = fs_q_zero_body_steps_successor * S ((S (S fs_i_zero_body_steps)) * fs_v_zero) + (fs_s_zero_body_steps))) /\ fs_s_zero_body_steps = fs_r_zero_body_steps + fs_a_zero_body_steps)))))) -> n = 0

Structural proof guide

The sum of an empty decoded prefix is zero.

Direct prerequisites: beta_at_unique. The authored body proceeds by case analysis (4).

Proof neighborhood

Direct dependencies

Direct dependents

Formal native tactic body

Dependencies are hypotheses of this body receipt. The focused endpoint audits separately check the complete empty-context certificates.

  1. 0001intro b
  2. 0002intro c
  3. 0003intro n
  4. 0004intro hsum
  5. 0005cases hsum
  6. 0006cases hsum_witness
  7. 0007cases hsum_witness_witness
  8. 0008cases hsum_witness_witness_right
  9. 0009specialize beta_at_unique x
  10. 0010specialize beta_at_unique x1
  11. 0011specialize beta_at_unique 0
  12. 0012specialize beta_at_unique n
  13. 0013specialize beta_at_unique 0
  14. 0014apply beta_at_unique
  15. 0015exact hsum_witness_witness_right_left
  16. 0016exact hsum_witness_witness_left