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Medieval English split tally stick ( front and reverse view). The stick is notched and inscribed to record a debt owed to the rural dean of Preston Candover , Hampshire, of a tithe of 20 d each on 32 sheep, amounting to a total sum of £2…
An illustration of Cantor's diagonal argument (in base 2) for the existence of uncountable sets . The sequence at the bottom cannot occur anywhere in the enumeration of sequences above.
An electric steam iron