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• Split-complex number — A portion of the split complex number plane showing subsets with modulus zero (red), one (blue), and minus one (green). In abstract algebra, the split complex numbers (or hyperbolic numbers) are a two dimensional commutative algebra over the real …   Wikipedia

• 2 × 2 real matrices — The set of 2 × 2 real matrices is denoted by M(2, R). Two matrices p and q in M(2, R) have a sum p + q given by matrix addition. The product matrix p q is formed from the dot product of the rows and columns of its factors… …   Wikipedia

• Cerámica técnica — Para otros usos de este término, véase Cerámica (desambiguación). La palabra cerámica deriva del vocablo griego keramos, cuya raíz sánscrita significa quemar . En su sentido estricto se refiere a la arcilla en todas sus formas. Sin embargo, el… …   Wikipedia Español

• Addition — is the mathematical process of putting things together. The plus sign + means that two numbers are added together. For example, in the picture on the right, there are 3 + 2 apples meaning three apples and two other apples which is the same as… …   Wikipedia

• Reloj — (Del cat. ant. relotge < lat. horologium < gr. horologion < hora, tiempo + lego, contar.) ► sustantivo masculino 1 METROLOGÍA Cualquier instrumento o mecanismo que sirve para medir el tiempo: ■ el reloj de la iglesia marca las diez en… …   Enciclopedia Universal