Lattices
Let number of types of primitive unit cells having unit cell parameter a=b=c be X .
Let number of types of primitive unit cells having all angles between edges a,b,c equal be Y
Find X+Y
The answer is 6.
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1 solution
X = 2 i.e cubic and rhombohedral also known as trigonal
Y = 4 i.e cubic , tetragonal , orthorhombic , and rhombohedral also known as trigonal