Usage:

① When δ > 0, the equation has two unequal real roots.

② When δ = 0, the equation has two equal real roots.

③ When δ < 0, the equation has no real root, but has two * * * yoke complex roots.

Deformation: complex delta.

Delta is the pronunciation of the fourth Greek letter, uppercase δ, lowercase δ. In mathematics or physics, the capitalized δ is used to represent the incremental symbol. Lowercase is usually used to represent variables or symbols in higher mathematics.

Bilingual example

The doctor diagnosed him with. Delta? Hepatitis.

The doctor diagnosed him with hepatitis D.

There is one? Delta? Between reality and ideal.

There is a difference between reality and ideal.

That? Delta? It is a common landform.

Delta is a common surface topography.