Add Term, Terms and TermSet- mirrors Pauli closely

[geo-chri]

This is part 1 of ~6 PRs covering issue 21

[geo-chri]

This is scaffolding. Multiplication, conjugation, sparse-string constructors, and per-component construction methods are deferred to follow-up PRs — they need fermion product/normal-ordering infrastructure that doesn’t exist yet. The empty marker traits (AsView, AsViewMut) are placeholders that PR 2 will hang real methods on without requiring downstream code to change its imports.

[obackhouse]

is this cmpnt major?

[geo-chri]

is this cmpnt major?

yes, creation operators in are_part and annihilation in ann_part

[obackhouse]

is this cmpnt major?

yes, creation operators in are_part and annihilation in ann_part

should it be in a directory to indicate that like with qubits? or is there no equivalent distinction?

[geo-chri]

is this cmpnt major?

yes, creation operators in are_part and annihilation in ann_part

should it be in a directory to indicate that like with qubits? or is there no equivalent distinction?

Now I see your point. Fermions have component-major inline in the flat fermion/operator. Should we organise into cmpnt_major and leave mode_majer for later if needed? I thought to keep it flat for now since we are scaffolding and not have the need for mode_major

[obackhouse]

is this cmpnt major?

yes, creation operators in are_part and annihilation in ann_part

should it be in a directory to indicate that like with qubits? or is there no equivalent distinction?

Now I see your point. Fermions have component-major inline in the flat fermion/operator. Should we organise into cmpnt_major and leave mode_majer for later if needed? I thought to keep it flat for now since we are scaffolding and not have the need for mode_major

yea i'd probably match the layout? up to you though

[geo-chri]

is this cmpnt major?

yes, creation operators in are_part and annihilation in ann_part

should it be in a directory to indicate that like with qubits? or is there no equivalent distinction?

Now I see your point. Fermions have component-major inline in the flat fermion/operator. Should we organise into cmpnt_major and leave mode_majer for later if needed? I thought to keep it flat for now since we are scaffolding and not have the need for mode_major

yea i'd probably match the layout? up to you though

makes sense, I will move things to cmpnt_major to stay consistent with Pauli

[matt-ryley-Quant]

Would be good to add a test or two here for different term types and check the coeff has been set to unit value.

[matt-ryley-Quant]

Approved with one minor comment regarding adding more tests.

Thanks for this!

[geo-chri]

Approved with one minor comment regarding adding more tests.

Thanks for this!

Good point! I will add the tests