- MATHEMATICA 11.2 PROBLEM FULL
- MATHEMATICA 11.2 PROBLEM CODE
- MATHEMATICA 11.2 PROBLEM SERIES
FermionLineExpand more completely simplifies FermionLineProduct objects. Addressed an issue that caused major performance slowdown on large expressions involving FermionLine objects. FermionLineExpand no longer avoids applying spinor equations of motion when downvalues to scalar products are assigned. FermionLineExpand and LoopIntegrate now correctly applies Sirlin identities to FermionLineProduct involving massive spinors (thanks, Matteo Fael). Longitudinal and Transverse no longer have HoldFirst attribute, since it used to interfere with simplification routines of other tensor algebraic functions like LoopIntegrate and Contract. Fixed a bug that caused General::optb error messages to be generated at initialization in earlier versions of Mathematica (thanks, Prasenjit Sanyal). 
Fixed a bug where LoopRefineSeries would not convert its input to analytic expressions when the input was independent of the expansion parameter (thanks, Prasenjit Sanyal).
MATHEMATICA 11.2 PROBLEM SERIES
Fixed a bug where Series would occasionally incorrectly expand DiscB at zero external momentum (thanks, Camilo Garcia Cely). Completed tutorial "Ward identities and γ5 in Dimensional Regularization" accessed from the guide page. Expanded tutorial "Scattering of Light by Light" accessed from the guide page. Updated documentation pages for compatibility with the style featured in Mathematica 11.1 and above. MATHEMATICA 11.2 PROBLEM CODE
The underlying code for FermionLineExpand to process FermionLineProduct objects has been modified.MandelstamRelations now includes the rule ε ->0 among the list of rules in its output.
MATHEMATICA 11.2 PROBLEM FULL
TraditionalForms of PVA, PVB, PVC, and PVD are now typeset in boldface to emphasize their full dependence on number of dimensions d, and to distinguish them from ScalarC0 and ScalarD0 (which are defined in 4 dimensions). Normal forms of PVD functions were unaffected. Fixed a bug affecting LoopRefine and LoopRefineSeries causing it to incorrectly convert ( n ≠ 4)-dimensional, weighted, or differentiated PVD functions to analytic expressions (thanks, Mirko Serino). Fixed a bug causing D0Expand to incorrectly convert ScalarD0 when an external invariant was on threshold with nonvanishing internal masses. 
Fixed a bug causing ScalarD0 to return 1/0 errors or incorrect values when an external invariant was evaluated on threshold with nonvanishing internal masses. Fixed a bug where D0Expand would fail to return an analytic expression when trying to expand ScalarD0IR16 in certain cases (thanks, Christoph Bobeth). Fixed a bug affecting FermionLineExpand and LoopIntegrate that occasionally caused FermionLineProduct to be expanded incorrectly. Added tutorial "Linking Package-X to COLLIER". Added tutorial "Tree-Level e + e − →γγ Cross Secion by The Optical Theorem". PVC no longer automatically reorganizes its arguments. LoopIntegrate and Projector no longer support v1.0 syntax. X`Utilities`EnableFancyInput and X`Utilities`DisableFancyInput have been renamed to X`Utilities`EnableFancyIO and X`Utilities`DisableFancyIO, respectively. It is no longer necessary to experimentally adjust the input precision to achieve the desired precision. The precision of output of special functions ( ScalarC0, ScalarD0, etc) evaluated with arbitrary precision arithmetic now tracks the precision of input. 
Option Part to LoopRefine can now take the setting Discontinuity to calculate discontinuities across normal threshold cuts of one-loop integrals. Added option Dimensions->4 to LoopIntegrate, LoopRefine, and LoopRefineSeries to facilitate the calculation of loop integrals in spacetime dimensions other than 4. Numerous symbols have been renamed to make Package‑ X command-line friendly ( more info). Fixed a harmless bug affecting only Mathematica 10.0 which caused LoopIntegrate to print a spurious cell during evaluation. Documentation pages have been pre-indexed for the Wolfram Documentation Center in Mathematica 11.2. Series can be applied to Inactive form of LoopIntegrate. Patel hhpatel Revision History Package‑X 2.1.1: (November 18, 2017)
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