By Sergio A. Albeverio, Raphael J. Høegh-Krohn, Sonia Mazzucchi (auth.)

Feynman direction integrals, instructed heuristically by means of Feynman within the 40s, became the root of a lot of up to date physics, from non-relativistic quantum mechanics to quantum fields, together with gauge fields, gravitation, cosmology. lately principles in accordance with Feynman direction integrals have additionally performed a massive function in components of arithmetic like low-dimensional topology and differential geometry, algebraic geometry, infinite-dimensional research and geometry, and quantity concept.

The 2d version of LNM 523 relies at the first authors' mathematical process of this thought awarded in its 1st variation in 1976. to keep up the numerous advancements considering the fact that then, a whole new bankruptcy at the present vanguard of study has been additional. apart from this new bankruptcy and the correction of some misprints, the elemental fabric and presentation of the 1st version has been maintained. on the finish of every bankruptcy the reader also will locate notes with additional bibliographical information.

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Although S(γ) and S0 (γ0 ) diverge, we see that S(γ) − S0 (γ0 ) is well deﬁned whenever γ˜ is absolutely continuous with derivative in L2 (R), if v+ and v− are diﬀerent from zero and the potential V tends to zero faster than |x|−1−ε for some positive ε. It is interesting to note that this are just the conditions that are needed for the existence of the scattering amplitude in quantum mechanics. Let now γ˜ (0) = x, we may then set γ˜ (τ ) = γ+ (τ ) + x γ− (τ ) + x for for τ ≥0 , τ ≤0 34 3 The Feynman Path Integral in Potential Scattering where γ± ∈ H± .

9) that ||x||∗ ≤ a|x|, where ||x||∗ is the norm in D∗ . 10) are continuous. In the general case is not uniquely given by B. However if B is non degenerate in the stronger sense that it has a bounded continuous inverse B −1 on H, then it follows easily that D = H, since D contains the range of B, and that (x, y) = (x, B −1 y). Hence is in this case unique and real. Since (x, y) is continuous on D × D we have that, for ﬁxed x, (x, y) is a continuous complex linear functional on D, hence in D∗ . 8), a left inverse of B, considered as a map from D(B) ⊂ D∗ into D.

38) is a bounded continuous linear functional on F (E, ). 3. Let E1 and E2 be two real separable Banach spaces and let x1 , x2 be a non degenerate bounded symmetric bilinear form on E1 . Let T be a bounded one-to-one mapping of E2 into E1 with a bounded inverse. Then T y1 , T y2 is a non degenerate bounded symmetric bilinear form on E2 . Moreover if f ∈ F(E1 , , ) then f (T y) is in F (E2 , T ·, T · ) and ∼ ∼ e i 2 x,x i f (x)dx = E1 e2 T y,T y f (T y)dy . E2 Proof. The non degeneracy of T y1 , T y2 follows from the fact that x1 , x2 is non degenerate and that T is one-to-one continuous and with a range equal to E1 .