How is this calculated?

A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.

Paris Saint-Germain led Ligue 1 after matchday 15 of 2023-24.

With 36 points, they were 4 ahead of Nice. Nothing was decided mathematically on this matchday.

Results

Date	Home	Score	Away
8 Dec	Montpellier	0–0	Lens
9 Dec	Rennes	1–2	Monaco
9 Dec	Paris Saint-Germain	2–1	Nantes
10 Dec	Nice	2–1	Stade de Reims
10 Dec	Clermont Foot	0–0	Lille
10 Dec	FC Metz	0–1	Brest
10 Dec	Strasbourg	2–1	Le Havre
10 Dec	Lyon	3–0	Toulouse
10 Dec	Lorient	2–4	Marseille

Table after matchday 15

Pos.	Team	Played	Goal diff.	Points	Max.	Title
1	Paris Saint-Germain	15	+26	36	93	In it
2	Nice	15	+10	32	89	In it
3	Monaco	15	+11	30	87	In it
4	Lille	15	+8	27	84	In it
5	Brest	15	+4	25	82	In it
6	Marseille	15	+6	23	80	In it
7	Lens	15	+4	23	80	In it
8	Stade de Reims	15	+0	23	80	In it
9	Nantes	15	-6	18	75	In it
10	Strasbourg	15	-6	17	74	In it
11	Le Havre	15	-4	16	73	In it
12	FC Metz	15	-8	16	73	In it
13	Rennes	15	-1	15	72	In it
14	Montpellier	15	-3	15	72	In it
15	Toulouse	15	-7	13	70	In it
16	Lorient	15	-9	12	69	In it
17	Clermont Foot	15	-12	11	68	In it
18	Lyon	15	-13	10	67	In it

Max.: the most points the team can still finish on.

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Quick answers

Who was top of Ligue 1 after matchday 15 of 2023-24?: Paris Saint-Germain led Ligue 1 after matchday 15 of 2023-24. With 36 points, they were 4 ahead of Nice.
What was decided on matchday 15 of the 2023-24 Ligue 1?: Nothing was decided mathematically on this matchday.
How is this calculated?: A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.