By Edward Kasner

The kin among arithmetic and physics were

presented so often and so competently in recent times, that

further dialogue would appear pointless. arithmetic,

however, is simply too frequently taken to be research, and the position of geom-

etry is missed. Geometry will be seen both as a department

of natural arithmetic, or because the least difficult of the actual sciences.

For our dialogue we decide the latter viewpoint: geometry

is the technological know-how of tangible actual or intuitive area. All actual

phenomena ensue in area, and consequently inevitably current

geometric features. We confine our dialogue to mechanics,

and ponder the r61e of geometry in mechanics.

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**Sample text**

Let f ∈ C02 (Rn ) and consider u(x,t) = E x ( f (xt )). 7) Then u(·,t) ∈ DA for each t and u is the unique solution of the initial value problem for the partial differential equation ∂u = Au, ∂t u(x, 0) = f (x), t > 0, x ∈ Rn , x ∈ Rn . 3 (The Heat Equation). Consider the Ito process dxt = dbt , in Rn . The generator of this process is 1 Af = Δf 2 by Ito’s formula. 1 the unique solution of the partial differential equation 1 ∂u = Δu, ∂t 2 u(x, 0) = f (x), t > 0, x ∈ Rn x ∈ Rn is u(x,t) = E x ( f (xt )).

However, for t0 fixed, we still have bt0 ∈ R. If bt ∈ Rn , then each component of bt (ω ) lies in C[0, ∞) and below we will let 0 ∈ Rn denote an n-vector with zero entries. 9. A Brownian motion or a Wiener process is a stochastic process {bt ;t ≥ 0} on some probability space (Ω , F , P), having the following four properties: 1. The process starts at 0: P(b0 = 0) = 1. 2. The increments are independent: If 0 ≤ t0 ≤ t1 ≤ · · · ≤ tk and Ai ∈ F , then P(bti − bti−1 ∈ Ai , i ≤ k) = ∏ P(bti − bti−1 ∈ Ai ).

4 on page 186. Consider the initial value problem for the SPDE: du = (Au + F(t, u))dt + G(t, u)dBt , u(x, 0) = u0 . 1, is given. As a function of x, u lies in a separable Hilbert space or a Banach space H and the initial data u0 (ω , x) is a F0 measurable random variable with values in H. The infinite-dimensional Brownian motion Bt = (bt1 , bt2 , . 57). Since Bt is infinitedimensional, we will assume that C is trace class or that trace C = ∑k∈Z3 \{0} ck < ∞. The operator A is the generator of a strongly continuous semigroup eAt , t ≥ 0, in H.

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