indicating the position of items in a vector or matrix. Miscellaneous q() quit options() view/set global options, e.g. number of digits history() view past commands you’ve issued <- assignment INSTALL package1 install package1 m1[,2] column 2 of matrix m1 m1[,2:5] or columns 2–5 m1[,c(2,3,4,5)]

Commutative, idempotent groupoids and the

and backchase

I hereby declare that I have created this work completely on my own and used no other sources or tools than the ones listed, and that I have marked any citations accordingly. Hiermit versichere ich, dass ich die vorliegende Arbeit selbständig verfasst und keine anderen als die angegebenen Quellen und Hilfsmittel benutzt sowie Zitate kenntlich gemacht habe.

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information,

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the human element. Many protocols do not scale beyond a pair of devices, although people often need to communicate with a group. The few exist-ing group protocols assume that users will always count the number of members and verify the list of members correctly. However, as group size increases, implemen

; where α = 5/3, f ∝ Re−1/4. These findings cannot be reconciled with the classic theory of the frictional drag. The classic theory provides no means of distinguishing between one type of turbulent spectrum and another, and cannot account for the existence of a “spectral link ” between the frictional drag