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Manuscript IX-A-ST@1 · IX-A-ST.tex · section · 6e99d1b2

The admission domain and its classical algebra

The admission domain and its classical algebra · lines 669–681

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For a smooth direction $η \in E$ , put

D_{η} F (Ψ) = \frac{d}{d s} F (Ψ + sη)_{s = 0} .

For a finite list $η = (η_{1}, \dots, η_{k})$ , write $D_{η} = D_{η_{1}} \dots D_{η_{k}}$ ; the empty list is the identity.

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$D_{η} F (Ψ) = \frac{d}{d s} F (Ψ + sη)_{s = 0} .$

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