default to numpy math functions, keep explicit import of libc.math
default to numpy math functions, keep explicit import of libc.math

zasdfgbnm/qutip,cgranade/qutip,cgranade/qutip,qutip/qutip,qutip/qutip,anubhavvardhan/qutip,anubhavvardhan/qutip,zasdfgbnm/qutip