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# Changelog (unreleased)
To avoid having old PRs put changes into the wrong section of the CHANGELOG,
new entries now go to the present file as discussed
[here](https://github.com/math-comp/math-comp/wiki/Agenda-of-the-April-23rd-2019-meeting-9h30-to-12h30#avoiding-issues-with-changelog).
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
## [Unreleased]
### Added
- in `ssrnat.v`, added lemma `sumnB`.
- in `seq.v`,
+ new higher-order predicate `pairwise r xs` which asserts that the relation
`r` holds for any i-th and j-th element of `xs` such that i < j.
+ new lemmas `allrel_mask(l|r)`, `allrel_filter(l|r)`, `sub(_in)_allrel`,
`pairwise_cons`, `pairwise_cat`, `pairwise_rcons`, `pairwise2`,
`pairwise_mask`, `pairwise_filter`, `pairwiseP`, `pairwise_all2rel`,
`sub(_in)_pairwise`, `eq(_in)_pairwise`, `pairwise_map`, `subseq_pairwise`,
`uniq_pairwise`, `pairwise_uniq`, and `pairwise_eq`.
- in `path.v`, new lemmas: `sorted_pairwise(_in)`, `path_pairwise(_in)`,
`cycle_all2rel(_in)`, `pairwise_sort`, and `sort_pairwise_stable`.
- in `interval.v`, new lemmas: `ge_pinftyE`, `le_ninftyE`, `gt_pinfty`, `lt_ninfty`.
### Changed
- In `ssralg.v` and `ssrint.v`, the nullary ring notations `-%R`, `+%R`, `*%R`,
`*:%R`, and `*~%R` are now declared in `fun_scope`.
### Renamed
- in `path.v`,
+ `sub_(path|cycle|sorted)_in` -> `sub_in_(path|cycle|sorted)`
+ `eq_(path|cycle)_in` -> `eq_in_(path|cycle)`
### Removed
### Infrastructure
### Misc
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