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Project-declaredLean 4.31.0

Proposition 3 7

HarderNarasimhan.proposition_3_7

Plain-language statement

Semistability of the initial segment and the “no improvement to the right” property. If x ∈ St μ, then: 1. the restriction of μ to the interval (⊥, x) is semistable, and 2. for any y > x, the μA-slope on (⊥, x) is not dominated by the slope on (x, y). This packages the two internal statements impl.prop3d7₁ and impl.prop3d7₂. API note:...

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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Project-declaredLean 4.31.0

Proposition 3 8

HarderNarasimhan.proposition_3_8

Plain-language statement

Totality/maximality consequences and the slope decomposition formula. Assuming convexity and an additional admissibility hypothesis (either totality of on S, or an attainment condition on μ), the internal results show: 1. St μ is totally ordered and, under DCC, admits a greatest element; and 2. for any stable breakpoint x and any y > x, the...

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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Project-declaredLean 4.31.0

Proposition 4 16

HarderNarasimhan.proposition_4_16

Plain-language statement

Proposition 4.16: a TFAE package relating the three equalities for μmin/μmax on TotIntvl, and (under chain conditions) equivalence with Nash equilibrium.

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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Project-declaredLean 4.31.0

Remark 2 5

HarderNarasimhan.remark_2_5

Plain-language statement

Remark 2.5 (paper-facing form). Under convexity, this states: - μmax μ is convex, and - μmax is idempotent and leaves μA unchanged on every interval. API note: the second component is universally quantified over intervals to facilitate rewriting in later files.

algebraic geometryvector bundlescategory theory

Source project: Harder-Narasimhan

Person-level attribution pending.

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