integral represetations of Jacobi ϑ functionsThe Jacobi theta functions have the following integral representations:ϑ1(z|τ)=-eiz+iπτ/4∫i-∞i+∞eiπτu2cos(2uz+πτu)sin(πu)duϑ2(z|τ)=-ieiz+iπτ/4∫i-∞i+∞eiπτu2cos(2uz+πu+πτu)sin(πu)duϑ3(z|τ)=-i∫i-∞i+∞eiπτu2cos(2uz+πu)sin(πu)duϑ4(z|τ)=-i∫i-∞i+∞eiπτu2cos(2uz)sin(πu)du