#### Vol. 315, No. 1, 2021

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An infinitesimal variant of the Guo–Jacquet trace formula, II

### Huajie Li

Vol. 315 (2021), No. 1, 151–207
##### Abstract

We establish an infinitesimal variant of the Guo–Jacquet trace formula for the case of a central simple algebra over a number field $F$ containing a quadratic field extension $E∕F$. It is an equality between a sum of geometric distributions on the tangent space of some symmetric space and its Fourier transform. To prove this, we need to define an analogue of Arthur’s truncation and then use the Poisson summation formula. We describe the terms attached to regular semisimple orbits as explicit weighted orbital integrals. To compare them to those for another case studied in our previous work, we state and prove the weighted fundamental lemma at the infinitesimal level by using Labesse’s work on the base change for ${GL}_{n}$.

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