PD0013

BetaAt(b,c,i,x)

x is the bounded beta-decoded value at index i.

Conservative notation; not a theorem, primitive, or axiom.

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

Definition in prerequisite notation

S x ≤ S (S i · c) ∧ (∃ y. b = y · S (S i · c) + x)

Only definitions earlier in this acyclic notation graph are used here.

Hygienic expanded first-order definition
((exists ff_h_defined_beta_at. ff_h_defined_beta_at + S (x) = S ((S (i)) * c)) /\ exists ff_q_defined_beta_at. b = ff_q_defined_beta_at * S ((S (i)) * c) + (x))

The unchanged native kernel never receives this surface symbol. Binder-safe expansion produces only its existing first-order syntax.

Direct definition dependencies

none — first-order arithmetic only

Definitions depending on this notation

Checked theorems using this definition

PG0001 · prime_field_polynomial_shift_existsPG0002 · prime_field_polynomial_shift_boundedPG0003 · prime_field_polynomial_shift_functionalPG0008 · prime_field_convolution_coefficient_shift_right_iffPG000A · prime_field_polynomial_convolution_shift_right_nonemptyPG0010 · beta_sum_pointwise_mod_scalePG0011 · polynomial_zero_extended_scale_congruentPG0015 · prime_field_polynomial_convolution_right_scalePG0018 · prime_field_polynomial_scale_zero_valuePG001A · prime_field_polynomial_append_shift_constant_addPG001B · prime_field_polynomial_append_shift_constant_decomposition_existsPG001C · prime_field_convolution_coefficient_right_append_addPG001E · prime_field_polynomial_convolution_right_append_equivalentPG001F · prime_field_polynomial_convolution_right_append_existsPG0023 · prime_field_polynomial_convolution_associativity_append_stepPG0025 · prime_field_polynomial_convolution_associative_equivalentPG002D · polynomial_diagonal_left_unit_first_termPG002F · polynomial_diagonal_left_unit_natural_sumPG0030 · prime_field_convolution_coefficient_left_unitPG0031 · prime_field_polynomial_convolution_left_unit_equalPG0032 · prime_field_polynomial_convolution_left_unit_equivalentPG0033 · prime_field_polynomial_convolution_left_unit_existsPG0034 · prime_field_polynomial_right_divides_reflexivePG004D · polynomial_diagonal_left_constant_first_termPG004E · polynomial_diagonal_left_constant_natural_sumPG004F · prime_field_convolution_coefficient_left_constantPG0050 · prime_field_polynomial_left_constant_product_to_scalePG0051 · prime_field_polynomial_scale_to_left_constant_productPG0052 · prime_field_polynomial_left_constant_product_existsPG0055 · prime_field_polynomial_scale_implies_right_dividesPG006D · prime_field_polynomial_nonzero_leading_equivalent_length_boundPG0072 · prime_field_polynomial_monic_singleton_multiple_equivalent