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**Cis** or **cis-** may refer to:

- Cis, Świętokrzyskie Voivodeship, south-central
- Cis, Warmian-Masurian Voivodeship, north

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https://wn.com/Cis

* Cis* is a genus of tree-fungus beetle in the family Ciidae.

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https://wn.com/Cis_(beetle)

In mathematics, an **equation** is an equality containing one or more variables. *Solving* the equation consists of determining which values of the variables make the equality true. In this situation, variables are also known as **unknowns** and the values which satisfy the equality are known as solutions. An equation differs from an identity in that an equation is not necessarily true for all possible values of the variable.

There are many types of equations, and they are found in many areas of mathematics. The techniques used to examine them differ according to their type.

Algebra studies two main families of equations: polynomial equations and, among them, linear equations. Polynomial equations have the form *P*(*x*) = 0, where *P* is a polynomial. Linear equations have the form *a*(*x*) + *b* = 0, where *a* is a linear function and *b* is a vector. To solve them, one uses algorithmic or geometric techniques, coming from linear algebra or mathematical analysis. Changing the domain of a function can change the problem considerably. Algebra also studies Diophantine equations where the coefficients and solutions are integers. The techniques used are different and come from number theory. These equations are difficult in general; one often searches just to find the existence or absence of a solution, and, if they exist, to count the number of solutions.

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https://wn.com/Equation

**CEO** is a chief executive officer, the highest-ranking corporate officers (executives) or administrators in an organisation.

**CEO** or **ceo** may also refer to:

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https://wn.com/CEO_(disambiguation)

**Cerium(IV) oxide**, also known as **ceric oxide**, **ceria**, **cerium oxide** or **cerium dioxide**, is an oxide of the rare earth metal cerium. It is a pale yellow-white powder with the chemical formula CeO_{2}.

Cerium(IV) oxide is formed by the calcination of cerium oxalate or cerium hydroxide.

Powdered ceria is slightly hygroscopic and will also absorb a small amount of carbon dioxide from the atmosphere.

Cerium also forms cerium(III) oxide, Ce

2O

3, which is an unstable compound that will oxidize to cerium (IV) oxide under standard conditions for temperature and pressure.

Cerium oxide has the fluorite structure, space group Fm__3__m, #225 containing 8 coordinate Ce^{4+} and 4 coordinate O^{2−} . At high temperatures it can be reduced to a non-stoichiometric, anion deficient form that retains the fluorite lattice, CeO_{(2-x)} where 0 < < 0.28. The value of depends on both the temperature and the oxygen partial pressure. The equation

has been shown to predict the equilibrium non stoichiometry over a wide range of oxygen partial pressures (10^{3} - 10^{−4} Pa) and temperatures (1000-1900 °C).

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https://wn.com/Cerium(IV)_oxide

I sat and stared at the sky.

I knew I'd find myself there again.

I wonder how else to cope with the air.

The air that brings me this luck.

I'm unlucky, that's just me

Seems what used to be has changed.

And I feel it coming again

I feel it coming with the wind

I feel it coming again

I feel it breaking with the wind

And I know, I won't feel it again if I just played along.

"Stupid games are for stupid people" and they end just like a song.

A song with no beginning, a song that has no meaning.

Just like this one, just like this one...

I sat and stared at the sky.

I knew I'd find myself there again.

I wonder how else to cope with the air.

And I feel it coming again

I feel it coming with the wind

I feel it coming again

I feel it breaking with the wind

And I know, I won't feel it again if I just played along.

"Stupid games are for stupid people" and they end just like a song.

A song with no beginning, a song that has no meaning.

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