Step-by-step derivation
S001 · implies
Before
source roles = [flow-network-qualification]
After
derived = [[vertices, source, sink, edge_capacity_flow_rows, antiparallel_pair_count, network_qualified, convention]]
Conditions: none
List the source field order without JavaScript.Gradient boundary uses its original mode to choose6,8 or7 fields;no padding or answer-derived mode.
Step identifiers and dependencies
Rule: source_ordered_fields_without_JS · Uses: G001
S002 · implies
Before
source roles = [[s8, a8, t8, u8], [[s8, a8], [a8, s8], [a8, t8], [t8, a8]], [45, 45, 45, 45], [36, 18, 27, 9], s8, t8]
After
derived = [[a8, s8, t8, u8], [[[a8, s8], 45, 18], [[a8, t8], 45, 27], [[s8, a8], 45, 36], [[t8, a8], 45, 9]], 2, Yes]
Conditions: none
Zip edge,capacity and flow by original index before source English canonical-edge sorting;vertices use UTF16.Opposite directions are distinct,zero capacity and isolated vertices are legal,and negative flow is retained for capacity failure rather than rewritten.
Step identifiers and dependencies
Rule: Flow_zip_source_edges_capacities_flows_BEFORE_order · Uses: G001, S001
S003 · implies
Before
source roles = [0, [a8, s8], 18, 45]
After
derived = [Yes, Yes, Yes]
Conditions: none
Every directed edge needs0<=flow<=capacity.A qualified network signature does not imply candidate-flow feasibility.
Step identifiers and dependencies
Rule: Flow_EACH_edge_two_sided_capacity_obligation · Uses: G001, S002
S004 · implies
Before
source roles = [1, [a8, t8], 27, 45]
After
derived = [Yes, Yes, Yes]
Conditions: none
Every directed edge needs0<=flow<=capacity.A qualified network signature does not imply candidate-flow feasibility.
Step identifiers and dependencies
Rule: Flow_EACH_edge_two_sided_capacity_obligation · Uses: G001, S003
S005 · implies
Before
source roles = [2, [s8, a8], 36, 45]
After
derived = [Yes, Yes, Yes]
Conditions: none
Every directed edge needs0<=flow<=capacity.A qualified network signature does not imply candidate-flow feasibility.
Step identifiers and dependencies
Rule: Flow_EACH_edge_two_sided_capacity_obligation · Uses: G001, S004
S006 · implies
Before
source roles = [3, [t8, a8], 9, 45]
After
derived = [Yes, Yes, Yes]
Conditions: none
Every directed edge needs0<=flow<=capacity.A qualified network signature does not imply candidate-flow feasibility.
Step identifiers and dependencies
Rule: Flow_EACH_edge_two_sided_capacity_obligation · Uses: G001, S005
S007 · calculation
Before
Flow ALL incoming at vertex a8 := sum(36, 9)
After
Flow ALL incoming at vertex a8 = 45
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S006
S008 · calculation
Before
Flow ALL outgoing at vertex a8 := sum(18, 27)
After
Flow ALL outgoing at vertex a8 = 45
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S007
S009 · implies
Before
source roles = [a8, [2, 3], [0, 1]]
After
derived = [45, 45, Yes, Yes]
Conditions: none
Sum all incoming and outgoing edges separately;an isolated vertex has0=0.Conservation is required only internally,but compute source/sink balances too for net values.
Step identifiers and dependencies
Rule: Flow_EACH_vertex_complete_directional_incidence · Uses: G001, S008
S010 · calculation
Before
Flow ALL incoming at vertex s8 := sum(18)
After
Flow ALL incoming at vertex s8 = 18
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S009
S011 · calculation
Before
Flow ALL outgoing at vertex s8 := sum(36)
After
Flow ALL outgoing at vertex s8 = 36
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S010
S012 · implies
Before
source roles = [s8, [0], [2]]
After
derived = [18, 36, No, No]
Conditions: none
Sum all incoming and outgoing edges separately;an isolated vertex has0=0.Conservation is required only internally,but compute source/sink balances too for net values.
Step identifiers and dependencies
Rule: Flow_EACH_vertex_complete_directional_incidence · Uses: G001, S011
S013 · calculation
Before
Flow ALL incoming at vertex t8 := sum(27)
After
Flow ALL incoming at vertex t8 = 27
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S012
S014 · calculation
Before
Flow ALL outgoing at vertex t8 := sum(9)
After
Flow ALL outgoing at vertex t8 = 9
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S013
S015 · implies
Before
source roles = [t8, [1], [3]]
After
derived = [27, 9, No, No]
Conditions: none
Sum all incoming and outgoing edges separately;an isolated vertex has0=0.Conservation is required only internally,but compute source/sink balances too for net values.
Step identifiers and dependencies
Rule: Flow_EACH_vertex_complete_directional_incidence · Uses: G001, S014
S016 · calculation
Before
Flow ALL incoming at vertex u8 := sum()
After
Flow ALL incoming at vertex u8 = 0
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S015
S017 · calculation
Before
Flow ALL outgoing at vertex u8 := sum()
After
Flow ALL outgoing at vertex u8 = 0
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S016
S018 · implies
Before
source roles = [u8, [], []]
After
derived = [0, 0, Yes, Yes]
Conditions: none
Sum all incoming and outgoing edges separately;an isolated vertex has0=0.Conservation is required only internally,but compute source/sink balances too for net values.
Step identifiers and dependencies
Rule: Flow_EACH_vertex_complete_directional_incidence · Uses: G001, S017
S019 · calculation
Before
Flow source NET outflow not gross outgoing := sub(36, 18)
After
Flow source NET outflow not gross outgoing = 18
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S018
S020 · calculation
Before
Flow sink NET inflow not gross incoming := sub(27, 9)
After
Flow sink NET inflow not gross incoming = 18
Conditions: none
Substitute original roles and established intermediates exactly;check nonzero denominators and do not round.
Step identifiers and dependencies
Rule: exact_rational_arithmetic · Uses: G001, S019
S021 · implies
Before
source roles = [s8, t8, [[[a8, s8], 18, 45, Yes], [[a8, t8], 27, 45, Yes], [[s8, a8], 36, 45, Yes], [[t8, a8], 9, 45, Yes]], [[a8, 45, 45, Yes], [u8, 0, 0, Yes]], 18, 18]
After
derived = [Yes, Yes, Yes, Yes, No]
Conditions: none
Every edge cancels in the sum of all vertex balances,so internal conservation implies equal source/sink net values.The converse fails when internal imbalances cancel.Capacity,each balance and net equality remain separate.Feasibility does not certify maximum/min-cut;No does not deny special optimal examples.
Step identifiers and dependencies
Rule: Flow_value_capacity_conservation_and_maximum_separate · Uses: G001, S020
Result
([a8, s8, t8, u8], s8, t8, [[[a8, s8], 45, 18], [[a8, t8], 45, 27], [[s8, a8], 45, 36], [[t8, a8], 45, 9]], 2, Yes, finite_loop_free_simple_digraph_with_explicit_antiparallel_convention_zero_capacities_and_disconnected_vertices_allowed)
The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.