NNNLO matching functions for FFs

Classes
class	apfel::C3nspff
	The O(αs3) valence plus matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3nsmff
	The O(αs3) valence minus matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3pvff
	The O(αs3) pure-valence matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3psff
	The O(αs3) pure-singlet matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3qgff
	The O(αs3) quark-gluon matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3gqff
	The O(αs3) gluon-quark matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...
class	apfel::C3ggff
	The O(αs3) gluon-gluon matching function for FFs (reference: https://arxiv.org/pdf/2012.03256.pdf). More...

Detailed Description