Z

Z

Z- axis : Axis passing through the origin and perpendicular to both X and Y – axes in three –dimensional coordinate system.

Z- coordinate : The distance of appoint from xy plane in 3-dimensional coordinate system.

z-intercept

The distance from the origin to the point where a curve intersects z-axis in three –dimensional coordinate system . In other words the point  at which a line crosses the z-axis.

Zenith : The highest point on the celestial sphere ( or in the sky ) directly overhead the observer.

Zero : The symbol is 0, also called cipher or naught. Its basic meaning is ‘nothing’

zero divisors

Non zero elements of a ring whose product is 0.

Zero Ring : The ring with only one element, its additive identity .

Zeta, Symbol, Z (Capital ) , ζ (lower case ) :  the sixth letter of Greek alphabet.

Zodiac : It denotes annual cycle of twelve stations along the elliptic path, followed by sun, that divide the ellipse into twelve equal zones of celestial longitude.

zero element

The element 0 is a zero element of a group if a+0=a and 0+a=a for all elements a.

Zone of Sphere

The portion of a sphere cut off  by two parallel planes is segment and the curved surface of spherical segment is zone of sphere.

Zorn’s Lema : Zorn’s Lema states that , if P is a partially ordered set such that every totally ordered subset of P has an upper bound in P, then P has a ( not necessarily unique ) maximal element.

 ZX – plane : The plane  formed by Z and Z axes. The equation of ZX plane is     Y = 0.