Pennsylvania Route 343 highway remained intact for another seven years, and in 1970, PA 343 was realigned for the final time, this time onto its current alignment. The northern terminus is now at a partial interchange with I-78. Pennsylvania Route 343 Pennsylvania Route 343 (PA 343) is an route between Lebanon and Fredericksburg in Lebanon County, Pennsylvania. It begins at PA 72 and ends at Exit 6 of Interstate 78 (I-78). PA 343 heads mostly through urbanized areas near Lebanon before continuing into rural areas further north. There is a concurrency with U.S. Route 22 (US 22) near the northern terminus. PA 343
Principal root of unity Principal root of unity In mathematics, a principal "n"-th root of unity (where "n" is a positive integer) of a ring is an element formula_1 satisfying the equations In an integral domain, every primitive "n"-th root of unity is also a principal formula_3-th root of unity. In any ring, if formula_3 is a power of formula_5, then any formula_6-th root of formula_7 is a principal formula_3-th root of unity. A non-example is formula_9 in the ring of integers modulo formula_10; while formula_11 and thus formula_9 is a cube root of unity, formula_13 meaning that it is not a "principal" cube