README: several regions are refinements[0], not bounds
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -139,7 +139,7 @@ Scope and limits:
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four-cell ghost band. It gives results identical to dense storage and is
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four-cell ghost band. It gives results identical to dense storage and is
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infrastructure for future block AMR, not a speedup.
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infrastructure for future block AMR, not a speedup.
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- Several regions: pass a sequence of `(x0, y0, x1, y1)` rectangles as
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- Several regions: pass a sequence of `(x0, y0, x1, y1)` rectangles as
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`bounds`, with both levels blocked (`level_blocks`). Transfers are built once
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`refinements[0]`, with both levels blocked (`level_blocks`). Transfers are built once
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from their union; adjacent, overlapping and concave unions are accepted when
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from their union; adjacent, overlapping and concave unions are accepted when
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their actual dependencies close. There is no fixed rectangle-gap rule.
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their actual dependencies close. There is no fixed rectangle-gap rule.
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The fine level is then one level-wide grid `(2*ny, 2*nx)`:
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The fine level is then one level-wide grid `(2*ny, 2*nx)`:
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