Integrationslag

Integrationslag is a term used in calculus to describe the fundamental rules that govern the operation of integration. It encompasses the methods and properties used to find antiderivatives (indefinite integrals) and to evaluate definite integrals, which represent accumulations such as areas or totals. The concept is rooted in the relationship between differentiation and integration, formalized by the Fundamental Theorem of Calculus.

Key components of integratingslag include the linearity of the integral and its behavior with respect to addition and scalar multiplication. Linearity states that the integral of a sum is the sum of the integrals and that constants can be factored out: ∫ (a f(x) + b g(x)) dx = a ∫ f(x) dx + b ∫ g(x) dx. The definite integral is additive over adjacent intervals: ∫_a^c f(x) dx = ∫_a^b f(x) dx + ∫_b^c f(x) dx. Substitution (u-substitution) allows transforming integrals by changing variables: ∫ f(g(x)) g'(x) dx = ∫ f(u) du. Integration by parts provides a tool for integrals of products: ∫ u dv = uv − ∫ v du.

The Fundamental Theorem of Calculus connects differentiation and integration: if f is continuous on [a, b], then any antiderivative F of f satisfies ∫_a^b f(x) dx = F(b) − F(a). Indefinite integrals yield families of antiderivatives, differing by constants, while definite integrals assign a numerical value to the accumulation over an interval. In practice, integratingslag guides techniques such as substitution, partial fractions, and trigonometric or numerical methods, depending on the function at hand.