Step-by-step derivation
S001 · implies
Before
source roles = [gd-boundary]
After
derived = [[mode, step_count, iterate_objective_records, convergence_or_global_optimality_claim, boundary]]
Conditions: none
List the complete operation/mode field order without JavaScript or answer-shape inference;Boolean,string,null and an unclaimed result remain distinct.
Step identifiers and dependencies
Rule: source_ordered_fields_without_JS · Uses: G001
S002 · calculation
Before
GD boundary ORIGINAL ORIGINAL gradient d*x coordinate0 := mul(1, 19)
After
GD boundary ORIGINAL ORIGINAL gradient d*x coordinate0 = 19
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S001
S003 · calculation
Before
GD boundary ORIGINAL ORIGINAL gradient plus b coordinate0 := sum(19, 18)
After
GD boundary ORIGINAL ORIGINAL gradient plus b coordinate0 = 37
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S002
S004 · calculation
Before
GD boundary ORIGINAL ORIGINAL gradient d*x coordinate1 := mul(2, 1)
After
GD boundary ORIGINAL ORIGINAL gradient d*x coordinate1 = 2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S003
S005 · calculation
Before
GD boundary ORIGINAL ORIGINAL gradient plus b coordinate1 := sum(2, -18)
After
GD boundary ORIGINAL ORIGINAL gradient plus b coordinate1 = -16
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S004
S006 · calculation
Before
GD boundary ORIGINAL ORIGINAL objective SQUARE FIRST coordinate0 := mul(19, 19)
After
GD boundary ORIGINAL ORIGINAL objective SQUARE FIRST coordinate0 = 361
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S005
S007 · calculation
Before
GD boundary ORIGINAL ORIGINAL diagonal times square coordinate0 := mul(1, 361)
After
GD boundary ORIGINAL ORIGINAL diagonal times square coordinate0 = 361
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S006
S008 · calculation
Before
GD boundary ORIGINAL ORIGINAL quadratic divide2 coordinate0 := div(361, 2)
After
GD boundary ORIGINAL ORIGINAL quadratic divide2 coordinate0 = 361/2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S007
S009 · calculation
Before
GD boundary ORIGINAL ORIGINAL linear product coordinate0 := mul(18, 19)
After
GD boundary ORIGINAL ORIGINAL linear product coordinate0 = 342
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S008
S010 · calculation
Before
GD boundary ORIGINAL ORIGINAL coordinate objective sum0 := sum(361/2, 342)
After
GD boundary ORIGINAL ORIGINAL coordinate objective sum0 = 1045/2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S009
S011 · calculation
Before
GD boundary ORIGINAL ORIGINAL objective running sum0 := sum(0, 1045/2)
After
GD boundary ORIGINAL ORIGINAL objective running sum0 = 1045/2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S010
S012 · calculation
Before
GD boundary ORIGINAL ORIGINAL objective SQUARE FIRST coordinate1 := mul(1, 1)
After
GD boundary ORIGINAL ORIGINAL objective SQUARE FIRST coordinate1 = 1
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S011
S013 · calculation
Before
GD boundary ORIGINAL ORIGINAL diagonal times square coordinate1 := mul(2, 1)
After
GD boundary ORIGINAL ORIGINAL diagonal times square coordinate1 = 2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S012
S014 · calculation
Before
GD boundary ORIGINAL ORIGINAL quadratic divide2 coordinate1 := div(2, 2)
After
GD boundary ORIGINAL ORIGINAL quadratic divide2 coordinate1 = 1
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S013
S015 · calculation
Before
GD boundary ORIGINAL ORIGINAL linear product coordinate1 := mul(-18, 1)
After
GD boundary ORIGINAL ORIGINAL linear product coordinate1 = -18
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S014
S016 · calculation
Before
GD boundary ORIGINAL ORIGINAL coordinate objective sum1 := sum(1, -18)
After
GD boundary ORIGINAL ORIGINAL coordinate objective sum1 = -17
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S015
S017 · calculation
Before
GD boundary ORIGINAL ORIGINAL objective running sum1 := sum(1045/2, -17)
After
GD boundary ORIGINAL ORIGINAL objective running sum1 = 1011/2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S016
S018 · implies
Before
source roles = [GD boundary ORIGINAL, [1, 2], [18, -18], [19, 1]]
After
derived = [[1, 2], [18, -18], [19, 1], [37, -16], 1011/2]
Conditions: none
For the WHOLE specified f(x)=1/2 sum d_i x_i²+sum b_i x_i,differentiate each coordinate to d_i x_i+b_i,not2d_i x_i.Compute ALL gradient entries first,then the objective in original order,squaring before multiplying d_i.Qualify positive diagonals,dimensions and coordinate order.
Step identifiers and dependencies
Rule: GD_WHOLE_positive_diagonal_quadratic_ordered_gradient_and_objective · Uses: G001, S017
S019 · calculation
Before
GD boundary step1 ORIGINAL alpha times gradient0 := mul(1/4, 37)
After
GD boundary step1 ORIGINAL alpha times gradient0 = 37/4
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S018
S020 · calculation
Before
GD boundary step1 ORIGINAL next coordinate0 := sub(19, 37/4)
After
GD boundary step1 ORIGINAL next coordinate0 = 39/4
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S019
S021 · calculation
Before
GD boundary step1 ORIGINAL alpha times gradient1 := mul(1/4, -16)
After
GD boundary step1 ORIGINAL alpha times gradient1 = -4
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S020
S022 · calculation
Before
GD boundary step1 ORIGINAL next coordinate1 := sub(1, -4)
After
GD boundary step1 ORIGINAL next coordinate1 = 5
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S021
S023 · calculation
Before
GD boundary step1 next recomputation ORIGINAL gradient d*x coordinate0 := mul(1, 39/4)
After
GD boundary step1 next recomputation ORIGINAL gradient d*x coordinate0 = 39/4
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S022
S024 · calculation
Before
GD boundary step1 next recomputation ORIGINAL gradient plus b coordinate0 := sum(39/4, 18)
After
GD boundary step1 next recomputation ORIGINAL gradient plus b coordinate0 = 111/4
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S023
S025 · calculation
Before
GD boundary step1 next recomputation ORIGINAL gradient d*x coordinate1 := mul(2, 5)
After
GD boundary step1 next recomputation ORIGINAL gradient d*x coordinate1 = 10
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S024
S026 · calculation
Before
GD boundary step1 next recomputation ORIGINAL gradient plus b coordinate1 := sum(10, -18)
After
GD boundary step1 next recomputation ORIGINAL gradient plus b coordinate1 = -8
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S025
S027 · calculation
Before
GD boundary step1 next recomputation ORIGINAL objective SQUARE FIRST coordinate0 := mul(39/4, 39/4)
After
GD boundary step1 next recomputation ORIGINAL objective SQUARE FIRST coordinate0 = 1521/16
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S026
S028 · calculation
Before
GD boundary step1 next recomputation ORIGINAL diagonal times square coordinate0 := mul(1, 1521/16)
After
GD boundary step1 next recomputation ORIGINAL diagonal times square coordinate0 = 1521/16
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S027
S029 · calculation
Before
GD boundary step1 next recomputation ORIGINAL quadratic divide2 coordinate0 := div(1521/16, 2)
After
GD boundary step1 next recomputation ORIGINAL quadratic divide2 coordinate0 = 1521/32
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S028
S030 · calculation
Before
GD boundary step1 next recomputation ORIGINAL linear product coordinate0 := mul(18, 39/4)
After
GD boundary step1 next recomputation ORIGINAL linear product coordinate0 = 351/2
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S029
S031 · calculation
Before
GD boundary step1 next recomputation ORIGINAL coordinate objective sum0 := sum(1521/32, 351/2)
After
GD boundary step1 next recomputation ORIGINAL coordinate objective sum0 = 7137/32
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S030
S032 · calculation
Before
GD boundary step1 next recomputation ORIGINAL objective running sum0 := sum(0, 7137/32)
After
GD boundary step1 next recomputation ORIGINAL objective running sum0 = 7137/32
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S031
S033 · calculation
Before
GD boundary step1 next recomputation ORIGINAL objective SQUARE FIRST coordinate1 := mul(5, 5)
After
GD boundary step1 next recomputation ORIGINAL objective SQUARE FIRST coordinate1 = 25
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S032
S034 · calculation
Before
GD boundary step1 next recomputation ORIGINAL diagonal times square coordinate1 := mul(2, 25)
After
GD boundary step1 next recomputation ORIGINAL diagonal times square coordinate1 = 50
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S033
S035 · calculation
Before
GD boundary step1 next recomputation ORIGINAL quadratic divide2 coordinate1 := div(50, 2)
After
GD boundary step1 next recomputation ORIGINAL quadratic divide2 coordinate1 = 25
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S034
S036 · calculation
Before
GD boundary step1 next recomputation ORIGINAL linear product coordinate1 := mul(-18, 5)
After
GD boundary step1 next recomputation ORIGINAL linear product coordinate1 = -90
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S035
S037 · calculation
Before
GD boundary step1 next recomputation ORIGINAL coordinate objective sum1 := sum(25, -90)
After
GD boundary step1 next recomputation ORIGINAL coordinate objective sum1 = -65
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S036
S038 · calculation
Before
GD boundary step1 next recomputation ORIGINAL objective running sum1 := sum(7137/32, -65)
After
GD boundary step1 next recomputation ORIGINAL objective running sum1 = 5057/32
Conditions: none
Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S037
S039 · implies
Before
source roles = [GD boundary step1 next recomputation, [[1, 1], [2, 1]], [[18, 1], [-18, 1]], [[39, 4], [5, 1]]]
After
derived = [[1, 2], [18, -18], [39/4, 5], [111/4, -8], 5057/32]
Conditions: none
For the WHOLE specified f(x)=1/2 sum d_i x_i²+sum b_i x_i,differentiate each coordinate to d_i x_i+b_i,not2d_i x_i.Compute ALL gradient entries first,then the objective in original order,squaring before multiplying d_i.Qualify positive diagonals,dimensions and coordinate order.
Step identifiers and dependencies
Rule: GD_WHOLE_positive_diagonal_quadratic_ordered_gradient_and_objective · Uses: G001, S038
S040 · implies
Before
source roles = [1/4, 1]
After
derived = [[[0, [19, 1], 1011/2], [1, [39/4, 5], 5057/32]], No]
Conditions: none
This mode requires only alpha>0,not the safe range.Retain the initial point and every later objective.A finite trace,whether decreasing or increasing,is not a general convergence/global-optimality certificate.
Step identifiers and dependencies
Rule: GD_finite_trace_ONLY_positive_not_safe_no_limit_claim · Uses: G001, S039