Algebraic structures over C^n functions #
In this file, we define instances of algebraic structures over C^n functions.
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Group structure #
In this section we show that C^n functions valued in a Lie group inherit a group structure
under pointwise multiplication.
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Coercion to a function as a MonoidHom. Similar to MonoidHom.coeFn.
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Coercion to a function as an AddMonoidHom.
Similar to AddMonoidHom.coeFn.
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For a manifold N and a C^n homomorphism φ between Lie groups G', G'', the
'left-composition-by-φ' group homomorphism from C^n⟮I, N; I', G'⟯ to C^n⟮I, N; I'', G''⟯.
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For a manifold N and a C^n homomorphism φ between additive Lie groups G',
G'', the 'left-composition-by-φ' group homomorphism from C^n⟮I, N; I', G'⟯ to
C^n⟮I, N; I'', G''⟯.
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For a Lie group G and open sets U ⊆ V in N, the 'restriction' group homomorphism from
C^n⟮I, V; I', G⟯ to C^n⟮I, U; I', G⟯.
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For an additive Lie group G and open sets U ⊆ V in N, the 'restriction'
group homomorphism from C^n⟮I, V; I', G⟯ to C^n⟮I, U; I', G⟯.
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Ring structure #
In this section we show that C^n functions valued in a C^n ring R inherit a ring structure
under pointwise multiplication.
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For a manifold N and a C^n homomorphism φ between C^n rings R', R'', the
'left-composition-by-φ' ring homomorphism from C^n⟮I, N; I', R'⟯ to C^n⟮I, N; I'', R''⟯.
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For a "C^n ring" R and open sets U ⊆ V in N, the "restriction" ring homomorphism from
C^n⟮I, V; I', R⟯ to C^n⟮I, U; I', R⟯.
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Coercion to a function as a RingHom.
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Function.eval as a RingHom on the ring of C^n functions.
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Semimodule structure #
In this section we show that C^n functions valued in a vector space M over a normed
field 𝕜 inherit a vector space structure.
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Coercion to a function as a LinearMap.
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Algebra structure #
In this section we show that C^n functions valued in a normed algebra A over a normed field 𝕜
inherit an algebra structure.
C^n constant functions as a RingHom.
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Coercion to a function as an AlgHom.
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Structure as module over scalar functions #
If V is a module over 𝕜, then we show that the space of C^n functions from N to V
is naturally a vector space over the ring of C^n functions from N to 𝕜.
C^n scalar-valued functions act by left-multiplication on C^n functions.
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The left multiplication with a C^n scalar function commutes with composition.
The space of C^n functions with values in a space V is a module over the space of C^n
functions with values in 𝕜.