The first derivative can be used to find the relative minimum and relative maximum values of a function over an open interval. These values are often called extreme values or extrema (plural form). A point is considered a minimum point if the value of the function at that point is less than the function values for all x-values in the interval.
Sancerre is a medieval hilltop town (ville), commune and canton in the Cher department of central France overlooking the Loire River.ancerre is a medieval hilltop town (ville), commune and canton in the Cher department of central France overlooking the Loire River.
Today, red Sancerre Rouge â made exclusively from Pinot Noir â accounts for less than 20% of the district's annual production. Until phylloxera wiped out vast tracts of vineyard in the 1860s, the vineyards here were planted mostly with red-wine varieties such as Gamay and Pinot Noir.t is only since the mid-20th century, and the creation of a protected Sancerre appellation, that the town's name has been so strongly associated with white wines. Prior to this, the district was better known for its light-bodied reds.