concavity
f is concave down (or just concave) if the chord between any two points (a, f(a)) and (b, f(b)) on the graph y = f(x) always lies below the graph. If f″(x) < 0 for all x, then f is concave down. The graph of f lies entirely below any of its tangents. A function is said to be concave down at a if it is concave down on some neighbourhood of a.
- sech
- second
- second
- second derivative
- second derivative test
- second fundamental form
- second-order logic
- second-order partial derivative
- section
- section formulae
- sector
- segment
- selection
- selection bias
- self-adjoint
- self-inverse
- self-reference
- self-selected samples
- self-similarity
- semi-
- semicircle
- semi-decidable
- semi-direct product
- semigroup
- semi-interquartile range