An inflection point is a point on a curve at which the sign of the curvature (i.e., the concavity) changes. Inflection points may be stationary points, but are not local maxima or local minima. For example, for the curve plotted above, the point is an inflection point. The first derivative test can sometimes distinguish inflection points from extrema for differentiable functions . The second derivative test is also useful. A necessary condition for to be an inflection point is . A sufficient condition requires and to have opposite signs in the neighborhood of (Bronshtein and Semendyayev 2004, p. 231).
Rice vermicelli are thin rice-flour noodles common in Chinese, Thai, Vietnamese, and other Southeast Asian cuisines, where they are often used in stir-fries, soups, spring rolls, and salads. Don't confuse rice vermicelli with cellophane noodles, another thin Asian noodle that's made with mung bean starch.
Vietnamese Pho: Rice Vermicelli Noodles. Made from rice flour, these noodles come fresh or dried. In terms of shape, rice noodles can be vermicelli, which have a similar thickness as angel hair pasta, or cut wider. If you're making pho (Vietnamese noodle soup) or any kind of Thai-inspired soup, get your rice noodles ready, because this is where they belong. 1  Quick Vietnamese Beef Pho. 2  Vegetarian Pho (Vietnamese Noodle Soup). 3  Quick Coconut Chicken Soup (it's begging for noodles to be added!). 4  Meal Plans. 5  Maker Talks. 6  How To.