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
.