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Merged
merged 6 commits into from
Mar 28, 2025
Merged

define nsymbol #4

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dd699cb
define nsymbol
ogauthe Dec 11, 2024
93e61b6
Merge branch 'main' into nsymbol
ogauthe Feb 27, 2025
54f95cc
remove label in nsymbol
ogauthe Feb 27, 2025
c8a1083
bump version
ogauthe Feb 27, 2025
1474646
Merge branch 'main' into nsymbol
ogauthe Mar 28, 2025
033baba
fix to_gradedrange
ogauthe Mar 28, 2025
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4 changes: 2 additions & 2 deletions src/abstractsector.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -55,8 +55,8 @@ quantum_dimension(::NotAbelianStyle, g::AbstractUnitRange) = sum(block_dimension
function nsymbol(s1::AbstractSector, s2::AbstractSector, s3::AbstractSector)
full_space = fusion_product(s1, s2)
i = findfirst(==(s3), blocklabels(full_space))
isnothing(i) && return labelled(0, s3)
return blocklengths(full_space)[i]
isnothing(i) && return 0
return unlabel(blocklengths(full_space)[i])
end

# =============================== Fusion rule interface ==================================
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14 changes: 4 additions & 10 deletions test/test_fusion_rules.jl
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@@ -1,6 +1,5 @@
using GradedUnitRanges:
dual, fusion_product, space_isequal, gradedrange, flip, tensor_product
using LabelledNumbers: label
using SymmetrySectors:
⊗,
Fib,
Expand Down Expand Up @@ -29,11 +28,10 @@ using TestExtras: @constinferred
@test (@constinferred z0 ⊗ z0) == z0

q = TrivialSector()
@test (@inferred q ⊗ q) == q
@test (@inferred q ⊗ z0) == z0
@test (@inferred z1 ⊗ q) == z1
@test (@constinferred q ⊗ q) == q
@test (@constinferred q ⊗ z0) == z0
@test (@constinferred z1 ⊗ q) == z1
@test nsymbol(q, q, q) == 1
@test label(nsymbol(q, q, q)) == q

# using GradedUnitRanges interface
@test space_isequal(fusion_product(z0, z0), gradedrange([z0 => 1]))
Expand All @@ -53,12 +51,9 @@ using TestExtras: @constinferred
@test q1 ⊗ q1 == U1(2)
@test q1 ⊗ q2 == U1(3)
@test q2 ⊗ q1 == U1(3)
@test (@inferred q1 ⊗ q2) == q3 # no better way, see Julia PR 23426

@test (@constinferred q1 ⊗ q2) == q3
@test nsymbol(q1, q2, q3) == 1
@test label(nsymbol(q1, q2, q3)) == q3
@test nsymbol(q1, q1, q3) == 0
@test label(nsymbol(q1, q1, q3)) == q3
end

@testset "O2 fusion rules" begin
Expand Down Expand Up @@ -277,7 +272,6 @@ end
)

@test nsymbol(ad8, ad8, ad8) == 2
@test label(nsymbol(ad8, ad8, ad8)) == ad8
end

@testset "Mixed GradedUnitRange - Sector fusion rules" begin
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