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??/??/???? - version 1.7.1
+
* Added companion matrix of a polynomial `companionmx p` and the
theorems: companionmxK, map_mx_companion and companion_map_poly
+ * Added allsigs, the dependent version of allpairs,
+ with notation `[seq E | i <- s & j <- t]`
+
* Added all_iff, "the following are all equivalent"
with notation [<-> P0; P1; ..; Pn] and theorems
`all_iffLR` and coercion `all_iffP` (see header for doc)