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Usage des lettres grecques en sciences. Un article de Wikipédia, l'encyclopédie libre.

Usage des lettres grecques en sciences

Greek letters used in mathematics, science, and engineering - Wikipedia. The Bayer designation naming scheme for stars typically uses the first Greek letter, α, for the brightest star in each constellation, and runs through the alphabet before switching to Latin letters.

Greek letters used in mathematics, science, and engineering - Wikipedia

The majority of English-speaking mathematicians use neither the modern nor the historical Greek pronunciations of the names of the letters, but the traditional English pronunciation, e.g. /ˈθeɪtə/ for θ (US pronunciation), cf. ancient [tʰɛ̂ːta] and modern [ˈθita]. Typography[edit] The Greek letter forms used in mathematics are often different from those used in Greek-language text: they are designed to be used in isolation, not connected to other letters, and some use variant forms which are not normally used in current Greek typography. Cérémonie de signature du partenariat UNESCO/INRIA - La préservation et le partage du patrimoine logiciel. 10 Programming Habits Developers Should Adopt. Learning programming is fun and easy, but writing a good program can prove to be a daunting task.

10 Programming Habits Developers Should Adopt

In most cases, we find ourselves constantly scratching our heads trying to understand the spaghetti code we wrote, or making lots of changes just because of a newly added minor feature. Laws of Software Development (that all developers should recognize) - The Guy and the Gal. Labels are so incredibly useful in life, but can also be quite dangerous.

Laws of Software Development (that all developers should recognize) - The Guy and the Gal

(I’ll write more on the dangerous impact of labels later) For now, I’d like to briefly discuss one type of label which I often find useful and sometimes entertaining. They’re called “eponymous laws”. That’s a strange name, but it’s simply the stating of some observation that is usually named after the person that observed it. 15 Fundamental Laws of Software Development. (AKA How To Sound Smart At Your Next Team Meeting) Occam's Razor This widely-known adage dates to a philosopher and friar from the fourteenth century named William of Ockham.

15 Fundamental Laws of Software Development

Occam's Razor is often stated as: "Among competing hypotheses, the one with the fewest assumptions should be selected. " 19 Eponymous Laws Of Software Development. One surefire way to sound really really smart is to invoke a law or principle named after some long dead guy (an alive guy is acceptable too, but lacks slightly in smart points). hammurapisThis realization struck me the other day while I was reading a blog post that made a reference to Postel’s law.

19 Eponymous Laws Of Software Development

Ordovicien ou l'explosion de la vie — Astronoo. L’Ordovicien est situé dans une époque de création de mers continentales peu profondes et riches en vie.

Ordovicien ou l'explosion de la vie — Astronoo

La vie animale n’existait que dans la mer mais il y a environ 440 à 445 millions d'années, à la limite entre l'Ordovicien et le Silurien, deux extinctions massives se produisent. Bien que les ères géologiques sont toutes marquées par des extinctions plus ou moins massives, les 5 grandes extinctions du phanérozoïque sont connues dont celle de la transition entre l'Ordovicien et le Silurien. Pendant l'Ordovicien, presque la totalité des terres immergées se situaient au sud de l'équateur. Une période de glaciation aurait entrainé des désordres climatiques et écologiques, cela semble être la cause de cette extinction. La diversité de la vie marine aurait régressé à cause de la baisse du niveau marin restreignant ainsi les écosystèmes. Échelle des temps géologiques.

Un article de Wikipédia, l'encyclopédie libre.

Échelle des temps géologiques

Histoire de la Terre cartographiée en 24 heures. Cartes à Jouer - Noms des Figures - Logiciel en Ligne ★ 2016 en 366 initiatives. Character Design References. Visual development art is a powerful source of inspiration, even when the final product is disappointing, the beauty and the excellent draftsmanship of the artworks created for movies, video games and comics stays untouched.

Character Design References

Studying the work of other artists can be an incredibly useful tool to help you in the further development of your artistic skills, but looking for specific material on the Internet can be extremely distracting and time consuming, and that's when our library comes in. The Character Design References visual library on Pinterest offers a quick way to access to an extensive and carefully researched collection of model sheets, concept artworks, sketches and tutorials from established and promising artists working in animation, movies, games, illustration and comics.

The Earth’s Geologic Time Scale Eons Eras Periods Epoch Life. ** The geologic time scale is a chronologic schema (or idealized model) relating stratigraphy to time that is used by geologists, paleontologists and other earth scientists to describe the timing and relationships between events that have occurred during the history of the Earth.

The Earth’s Geologic Time Scale Eons Eras Periods Epoch Life

The table of geologic time spans presented here agrees with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geological Survey. Evidence from radiometric dating indicates that the Earth is about 4.570 billion years old. The geological or deep time of Earth's past has been organized into various units according to events which took place in each period. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions. The largest defined unit of time is the supereon, composed of eons. Plus de 1000 idées à propos de Biology sur Pinterest. SuiteFibonacci.