concave upward

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• Concave function — In mathematics, a concave function is the negative of a convex function. A concave function is also synonymously called concave downwards, concave down, convex upwards, convex cap or upper convex. Contents 1 Definition 2 Properties 3 Examples …   Wikipedia

• valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system …   Universalium

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium

• fold — fold1 foldable, adj. /fohld/, v.t. 1. to bend (cloth, paper, etc.) over upon itself. 2. to bring into a compact form by bending and laying parts together (often fol. by up): to fold up a map; to fold one s legs under oneself. 3. to bring (the… …   Universalium

• Convex function — on an interval. A function (in black) is convex if and only i …   Wikipedia

• lopolith — /lop euh lith/, n. Geol. a mass of igneous rock similar to a laccolith but concave downward rather than upward. [1915 20; < Gk lop(ós) shell, husk + o O + LITH] * * * ▪ geology       igneous intrusion associated with a structural basin, with… …   Universalium

• seismic wave — Vibration generated by an earthquake, explosion, or similar phenomenon and propagated within the Earth or along its surface. Earthquakes generate two principal types of waves: body waves, which travel within the Earth, and surface waves, which… …   Universalium

• syncline —     a) [ landform ]    A unit of folded strata that is concave upward whose core contains the stratigraphically younger rocks, and occurs at the earth’s surface. In a single syncline, beds forming the opposing limbs of the fold dip toward its… …   Glossary of landform and geologic terms

• inflection point — noun Date: circa 1721 a point on a curve that separates an arc concave upward from one concave downward and vice versa …   New Collegiate Dictionary

• soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… …   Universalium

• point of inflection — a point on a curve that separates an arc concave upward from one concave downward and vice versa * * * Math. See inflection point. [1735 45] …   Useful english dictionary