Counting solutions of a linear Diophantine equation in an interval

Also called Finding the number of solutions and the solutions in a given interval.

Count the integer solutions of a x plus b y equals c whose x and y both lie in given ranges.

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The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.

Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
Lean	L0 no Lean part	name a Lean module in the lean field (07)
Visual	V0 none	add viz/scene.ts or a figure (10)
Writing	W0 stub	Definition one source with a locator