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Buildings of Spherical Type and Finite BN-Pairs by J. Tits

By J. Tits

Those notes are a touch revised and prolonged model of mim- graphed notes written at the party of a seminar on structures and BN-pairs held at Oberwolfach in April 1968. Their major function is to give the answer of the subsequent difficulties: (A) selection of the structures of rank >; and irreducible, round sort, except ~ and H ("of round sort" potential "with finite Weyl four group", in regards to the excluded varieties H, cf. the addenda on p. 274). approximately talking, these constructions all become linked to easy algebraic or classical teams (cf. 6. ;, 6. 1;, eight. four. ;, eight. 22, nine. 1, 10. 2). a simple software presents the enumeration of all finite teams with BN-pairs of irreducible kind and rank >;, as much as general subgroups contained in B (cf. eleven. 7). (B) selection of all isomorphisms among constructions of rank > 2 and round kind linked to algebraic or classical easy teams and, in parti­ cular, description of the complete automorphism teams of such constructions (cf. five. eight, five. nine, five. 10, 6. 6, 6. 1;, eight. 6, nine. ;, 10. 4). with the exception of the appendices, the notes are relatively strictly orientated - ward those targets.

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G. black ones are filled with carbon dioxide). g. a carbon dioxide extinguisher will be red with a black stripe, triangle or lettering. Care should, therefore, be taken when choosing an extinguisher that the correct type is being used prior to attempting to extinguish a fire. Here are a few safety points to remember: Key point Always read the operating instructions on the extinguisher before use.  Never use a fire extinguisher unless you have been trained to do so  Do not use water or water-type extinguishers on electrical fires due to the risk of electric shock and explosion  Do not use water or water-type extinguishers on oils or fats, as this too can cause an explosion  Do not handle the nozzle when using carbon dioxide extinguishers as this can cause freeze burns to the hands  Do not use the carbon dioxide extinguisher or halon types in a confined space or small room, as this could cause suffocation.

Before working with mobile tower scaffolds, it is very important to take into consideration the height of the tower. The taller the tower, the more likely it is to become unstable, where towers are to be used in exposed or external conditions, the height of the working platform must be no greater than 3 times the minimum base dimension. 5 that of the base dimension. A typical example would be a tower which has a base dimension of 2 m  3 m, so the maximum would be 6 m for external use and 7 m for internal use.

More than 30,000 injuries to the feet are reported each year and many more accidents go unrecorded. Accidents to the feet have serious consequences and can result in pain and suffering, disability, loss of work and income. 6). The basic universal form of foot protection is the safety shoe which will usually include some kind of metallic toe protection, rubber soles and sturdy leather uppers. The illustration shows typical safety boot/shoe protection. 7 shows the protection of two irreplaceable tools – your hands, which you use for almost everything including working, playing, driving, eating, etc.

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