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In mathematics, convolution is a mathematical operation on two functions that produces a third function. The term convolution refers to both the result function and to the process of computing it. It is defined as the integral of the product of the two functions after one is reflected about the y-axis and shifted. The integral is evaluated for all values of shift, producing the convolution function. The choice of which function is reflected and shifted before the integral does not change the integral result. Graphically, it expresses how the 'shape' of one function is modified by the other.
In physics, engineering and mathematics, the Fourier transform (FT) is an integral transform that converts a function into a form that describes the frequencies present in the original function. The output of the transform is a complex-valued function of frequency. The term Fourier transform refers to both this complex-valued function and the mathematical operation. When a distinction needs to be made the Fourier transform is sometimes called the frequency domain representation of the original function. The Fourier transform is analogous to decomposing the sound of a musical chord into the intensities of its constituent pitches.
This gallery of sovereign state flags shows the national or state flags of sovereign states that appear on the list of sovereign states. For flags of other entities, please see gallery of flags of dependent territories. Each flag is depicted as if the flagpole is positioned on the left of the flag, except for those of Iran, Iraq and Saudi Arabia which are depicted with the hoist to the right.
Roman is a city located in the central part of Western Moldavia, a traditional region of Romania. It is located 46 km (29 mi) east of Piatra Neamț, in Neamț County at the confluence of the rivers Siret and Moldova.
Lomaria is a genus of ferns belonging to the family Blechnaceae.
Drepaninae are by far the largest subfamily of the Drepanidae moths. While it is usually split into two tribes, Drepanini and Oretini, its internal systematics and phylogeny are not well resolved.
Lachnocnema, commonly called woolly legs, is a genus of butterflies in the family Lycaenidae found mainly in Sub-Saharan Africa. Identification requires dissection to reveal subtle genital distinctions.
Metachrostis is a genus of moths of the family Erebidae first described by Jacob Hübner in 1820.
Gallienica is a genus of moths in the family Erebidae erected by Paul Griveaud in 1976. All the species are known from Madagascar.
Porthesaroa is a genus of moths in the subfamily Lymantriinae. The genus was erected by Erich Martin Hering in 1926.
Didymana is a genus of moths belonging to the subfamily Drepaninae.
Antroposthiidae is a family of acoels, containing three genera and four species:
Lachnocnema brunea is a butterfly in the family Lycaenidae. It is found in Cameroon, the Democratic Republic of the Congo, Uganda, north-western Tanzania, and western Kenya.
Porthesaroa brunea is a moth of the subfamily Lymantriinae. It is found in central Madagascar.
Pialea is a genus of small-headed flies. It is known from South America.
Didymana bidens is a moth in the family Drepanidae. It was described by John Henry Leech in 1890. It is found in the Chinese provinces of Hubei, Sichuan, Yunnan, Shaanxi and Fujian and in north-eastern Myanmar.
Didymana ancepsa is a moth in the family Drepanidae. It was described by Hong-Fu Chu and Lin-Yao Wang in 1987. It is found in China.
F. Brunea-Fox was a Romanian reporter, journalist and translator.
Haploposthia is a genus of worms belonging to the family Proporidae.
Convoluella is a genus of worms belonging to the family Antroposthiidae.
References
- ↑ Beccaloni, G.; Scoble, M.; Kitching, I.; Simonsen, T.; Robinson, G.; Pitkin, B.; Hine, A.; Lyal, C., eds. (2003). "Didymana brunea". The Global Lepidoptera Names Index . Natural History Museum . Retrieved May 1, 2018.
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