dim(A+B)
=
dim A
+
dim B
−
dim(A∩B)
2
=
1
+
1
−
0
Sums & Intersections
dim(A+B) = dim A + dim B − dim(A∩B)
Created by Wangrui Zhao
Configuration
Two lines in R²
Line + Plane in R³
Two planes in R³
Tilt angle θ of line B
θ = 90°
Subspaces
Intersection A ∩ B
Sum A + B