Read the equation
This relation defines E_inter(k, k+1) in the source section “IX. 44-BOND ENERGY FUNCTIONS · E_inter(k, k+1)”. Evaluates oscillatory sine or cosine terms using the stated phase or frequency. Its interpretation depends on the source’s stated variables and conditions; this record does not assign an unprovided physical or cognitive meaning to them.
Terms & definitions
The recovered passage does not supply a separate symbol table. Read the source context for the notation used in this version; familiar letters may carry different meanings in other builds.
How it works
Read E_inter(k, k+1) as the quantity being defined or updated by this relation.
Evaluates oscillatory sine or cosine terms using the stated phase or frequency.
Use this version’s variable definitions and update order. The same symbol may be assigned a different meaning in another build.
Assumptions & limits
This source expression was recovered from the pinned code revision. Its presence does not establish that the associated program was built, run, or scientifically validated.
Original context
Read the surrounding source passage
// E_intra(k) = ½κ_intra(L_k - L₀)²
double intra_strand_energy(double L_k) const {
double dL = L_k - L0_INTRA;
return 0.5 * kappa_intra_ * dL * dL;
}
// Inter-strand energy (Bonds 17-32):
// E_inter(k, k+1) = ½κ_inter(d_{k,k+1} - d₀)² + ε·cos(2π/10.6 · k)
double inter_strand_energy(double d_k, int k) const {
double dd = d_k - D0_INTER;
double harmonic = 0.5 * kappa_inter_ * dd * dd;
double periodic = epsilon_ * std::cos(TWIST_ANGLE_RAD * k);
return harmonic + periodic;
}
// Cross-helix energy (Bonds 33-44) - Lennard-Jones:
// E_cross(i,j) = -ε_cross/d_{ij}⁶ + σ_cross/d_{ij}¹²
double cross_helix_energy(double d_ij) const {Exact original notation
E_inter(k, k+1) = ½κ_inter(d_{k,k+1} - d₀)² + ε·cos(2π/10.6 · k)