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Centuries: 1st century BC - 1st century - 2nd century

Decades: 0s 10s 20s 30s 40s - 50s - 60s 70s 80s 90s 100s

Years: 49 50 51 52 53 - 54 - 55 56 57 58 59




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Product of groups

... is an element of K, so that hh' is in H and h' -1kh'k' is in K, as required. An analogous argument shows that (hk)-1 is of the form h'k' . Of particular interest are ...