dual space W* of W can naturally identified with linear functionals

The first dual mission in space started in 1963, space craft: Vostock 5-6 sent by the USSR

DUAL table

A dual layer DVD has more space compared to a single layer DVD. Instead of holding 4.7GB, a dual layer DVD can hold over 8GB. Aside from more space, they also tend to read faster than single layer ones.

The dual layer burner supports DVD-DL discs, dual layer DVDs with just under 9GB of storage space.