# New PDF release: How to draw a straight line

By Alfred Bray Kempe

This quantity is made from electronic pictures from the Cornell collage Library ancient arithmetic Monographs assortment.

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137) (hg)

7. Let R be an ordinary Ropf algebra with cfJ, "ad-invariant" in the sense of (A96), obeying the counital3-cocycle condition. Then (H, cfJ) 1. BASICS FOR QUANTUM GROUPS 1-46 is a quasi Hopf algebra. The antipode in this case involves the same S and (3 = 1 with o: = c- 1 where c = I: q}(Sq;2)q;3 is central. One assumes that q; and care invertible. h then q; = 8F is an ad-invariant 3-cocycle of the form required. To see this one notes first that in general. (when H is noncocommutative) the ad-invariance conditions used here are not the same as the requirement of invariance under the quantum adjoint action Adh(g) = I: h1gSh 2, extended to tensor powers.

The tensor product comodule V 0 W is defined via the coaction (A88) ,8Vl8>w(v 0 w) = 2:v 1 0 w 1 0 v 2w 2 in terms of the coactions on V, W and the product of A. ) = ). 0 1. 6) form a monoidal category with the same tensor product of comodules (A88) and (A89) 4>«v 0 w) 0 z) = 2:v 1 0 (w 1 0 zl)cjJ(v 2 0 w 2 0 z2). One can also make general constructions for monoidal categories as objects in their 1-40 1. BASICS FOR QUANTUM GROUPS own right (in the category of monoidal cateories). For example the dual monoidal category CO of Majid of representations of a monoidal category (C, 181).