# Often asked: What Is Convex In Math?

## What convex means?

1a: curved or rounded outward like the exterior of a sphere or circle. b: being a continuous function or part of a continuous function with the property that a line joining any two points on its graph lies on or above the graph.

## What is a convex object?

A shape or object is said to be convex when it is curved outward. To determine if a shape is convex, we can draw two points somewhere within the shape and see whether or not the line connecting them goes outside the shape.

## What does concave mean in maths?

Curved inwards. Example: A polygon (which has straight sides) is concave when there are “dents” or indentations in it (where the internal angle is greater than 180°)

## What is convex set with example?

Equivalently, a convex set or a convex region is a subset that intersect every line into a single line segment (possibly empty). For example, a solid cube is a convex set, but anything that is hollow or has an indent, for example, a crescent shape, is not convex.

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## What does convex do?

Concave describes shapes that curve inward, like an hourglass. Convex describes shapes that curve outward, like a football (or a rugby ball).

## What is another word for Convex?

Convex Synonyms – WordHippo Thesaurus. What is another word for convex?

bulging gibbous
outcurved protuberant
rounded cambered
swelling arched
bent biconvex

## Are glasses concave or convex?

Eyeglass lenses will almost always be convex on the outer surface, the one farthest from the eye, simply to fit it to the curvature of the face.

## What is the example of convex polygon?

A planar polygon is convex if it contains all the line segments connecting any pair of its points. Thus, for example, a regular pentagon is convex (left figure), while an indented pentagon is not (right figure). A planar polygon that is not convex is said to be a concave polygon.

## Is a mirror a convex?

A convex mirror or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. The image is smaller than the object, but gets larger as the object approaches the mirror.

## How do you know if a function is concave or convex?

For a twice-differentiable function f, if the second derivative, f ”(x), is positive (or, if the acceleration is positive), then the graph is convex (or concave upward); if the second derivative is negative, then the graph is concave (or concave downward).

## Is convex concave up or down?

Concave down then equals convex up, meaning that the curve is lower part of a concave epigraph or the upper part of a convex hypograph. Hope this helps!

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## Is log concave or convex?

The logarithm f(x) = log x is concave on the interval 0 <x< ∞, and the exponential f(x) = ex is convex everywhere.

## What do you mean by convex hull?

In geometry, the convex hull or convex envelope or convex closure of a shape is the smallest convex set that contains it. For a bounded subset of the plane, the convex hull may be visualized as the shape enclosed by a rubber band stretched around the subset.

## Is a hyperplane convex?

Supporting hyperplane theorem is a convex set. The supporting hyperplanes of convex sets are also called tac-planes or tac- hyperplanes. A related result is the separating hyperplane theorem, that every two disjoint convex sets can be separated by a hyperplane.

## What is a convex graph?

In mathematics, a real-valued function defined on an n-dimensional interval is called convex if the line segment between any two points on the graph of the function lies above the graph between the two points.