# text constant

txt_up0 = "\u2070"  # upper script of 0
txt_up1 = "\u00B9"  # upper script of 1
txt_up2 = "\u00B2"  # upper script of 2

txt_sub0 = "\u2080"  # sub script of 0
txt_sub1 = "\u2081"  # sub script of 1
txt_sub2 = "\u2082"  # sub script of 2

# Greek lower case letters
txt_lam = "\u03BB"  # lambda
txt_eps = "\u03B5"  # epsilon
txt_tht = "\u03B8"  # theta
txt_zta = "\u03B6"  # zeta
txt_eta = "\u03B7"  # eta
txt_mu = "\u03BC"  # mu
txt_nu = "\u03BD"  # nu
txt_xi = "\u03BE"  # xi
txt_pi = "\u03C0"  # pi
txt_rho = "\u03C1"  # rho
txt_sgm = "\u03C3"  # sigma
txt_tau = "\u03C4"  # tau
txt_phi = "\u03C6"  # phi
txt_kai = "\u03C7"  # kai
txt_psi = "\u03C8"  # psi
txt_omg = "\u03C9"  # omega

txt_dudt = 'du/dt or ' + txt_lam + 'u'
txt_du2dt2 = 'd' + txt_up2 + "u/dt" + txt_up2 + ' or ' + txt_lam + txt_up2 + "u"

