HM Customs Gibraltar Officer key terms

A symbol representing a quantity whose permitted values must follow the stated domain and the units of the problem rather than an unstated assumption.

The allowed inputs or values for a mathematical statement, including any restrictions from the context, a denominator, an even root or a count.

A claim that two expressions have equal values, whose solutions must make the original relation true and satisfy the declared restrictions.

A comparison describing values above or below a boundary, with inclusion or exclusion of the boundary indicated by the relation used.

A rule or relation assigning each permitted input exactly one output, distinguished from a general relation that may assign multiple outputs to one input.

The change in the vertical variable divided by the change in the horizontal variable between appropriate points on a nonvertical line.

A point where a graph meets a specified coordinate axis, whose interpretation depends on the variable definitions and whether that point belongs to the model domain.

A multiplicative component of an expression or integer, distinguished from a term separated by addition when deciding whether cancellation is valid.

Expressions that represent the same value on the relevant common domain, with any original exclusions preserved when a simplification changes the displayed form.

A comparison by division between quantities, interpreted with the quantities in the stated order and with compatible units when required.

A relative increase or decrease calculated by dividing the difference by the specified baseline, then expressing that fraction per hundred.

A unit for the arithmetic difference between two percentages, distinct from the relative percent change obtained by dividing by a baseline.

The way a verb phrase presents an event or state in relation to time, such as ongoing, completed or connected with the present.

A conventional combination of words whose natural use is learned in context, rather than created by substituting any dictionary synonym.

Language choices suited to the situation, audience, purpose and relationship, such as a formal request or an informal message to a friend.

A construction linking a condition with a result, whose forms help express real possibilities, imagined situations or unreal past events.

Idea central o asunto del que trata un texto, que se puede enunciar en una frase y se distingue de los temas secundarios que lo acompañan.

Postura o afirmación principal que el autor defiende en un texto argumentativo; suele aparecer en la introducción o el cierre y el resto del texto la sostiene.

Reformulación breve y fiel del contenido de un texto, con las ideas esenciales y sin opiniones ni detalles accesorios, respetando el orden lógico del original.

Propiedad textual por la que las ideas se organizan en torno a un tema con una progresión lógica, sin contradicciones ni saltos que rompan el sentido global.

Conjunto de mecanismos lingüísticos (conectores, pronombres, elipsis, repeticiones léxicas) que enlazan las oraciones y párrafos de un texto para que se lean como una unidad.

Palabra o locución que señala la relación lógica entre segmentos del texto: adición, contraste, causa, consecuencia, orden o ejemplificación, entre otras.

Unidad lingüística que guía la interpretación del discurso y organiza la conversación o el texto escrito, como 'en primer lugar', 'sin embargo' o 'por cierto'.

Reescritura de un enunciado o texto con otras palabras, conservando su significado esencial; puede ser explicativa, cuando aclara el contenido, o mecánica.