Issue 436 (#437)

* close issue 436

* version bump

Author: jverzani

Project.toml

@@ -1,6 +1,6 @@
 name = "SymPy"
 uuid = "24249f21-da20-56a4-8eb1-6a02cf4ae2e6"
-version = "1.0.51"
+version = "1.0.52"
 
 [deps]
 CommonEq = "3709ef60-1bee-4518-9f2f-acd86f176c50"

src/matrix.jl

@@ -111,9 +111,9 @@ Base.:+(A::AbstractMatrix{T}, J::UniformScaling) where {T <: SymbolicObject} = (
 Base.:+(A::AbstractMatrix, J::UniformScaling{T}) where {T <: SymbolicObject} = (n=LinearAlgebra.checksquare(A); A .+ J.λ*I(n))
 Base.:+(A::AbstractMatrix{T}, J::UniformScaling{T}) where {T <: SymbolicObject} = (n=LinearAlgebra.checksquare(A); A .+ J.λ*I(n))
 
-Base.:-(J::UniformScaling, A::AbstractMatrix{T}) where {T <: SymbolicObject} = A + (-J)
-Base.:-(J::UniformScaling{T}, A::AbstractMatrix) where {T <: SymbolicObject} = A + (-J)
-Base.:-(J::UniformScaling{T}, A::AbstractMatrix{T}) where {T <: SymbolicObject} = A + (-J)
+Base.:-(J::UniformScaling, A::AbstractMatrix{T}) where {T <: SymbolicObject} = (-A) + J
+Base.:-(J::UniformScaling{T}, A::AbstractMatrix) where {T <: SymbolicObject} = (-A) + J
+Base.:-(J::UniformScaling{T}, A::AbstractMatrix{T}) where {T <: SymbolicObject} = (-A) + J
 
 
 # Issue 397 so that A' infers correctly