gm

// See https://hack.org/mc/writings/xkb.html

default  partial alphanumeric_keys alternate_group
xkb_symbols "basic" {
	name[Group1] = "Mathematik"; // Greek (mathematical)

	include "level3(ralt_switch)"

    key <AD01> { [                 U211A,          U221A ] }; // ℚ √
    key <AD02> { [                 U212F,         U1D4BE ] }; // ℯ 𝒾 
    key <AD03> { [         Greek_epsilon,  Greek_EPSILON, U2203, U2204 ] }; // ε Ε ∃ ∄
    key <AD04> { [             Greek_rho,      Greek_RHO, U211D ] }; // ρ Ρ ℝ
    key <AD05> { [             Greek_tau,      Greek_TAU ] }; // τ Τ
    key <AD06> { [            Greek_zeta,     Greek_ZETA, U2124 ] }; // ζ Ζ ℤ
    key <AD07> { [           Greek_theta,    Greek_THETA ] }; // θ Θ
    key <AD08> { [            Greek_iota,     Greek_IOTA ] }; // ι Ι
    key <AD09> { [         Greek_omicron,  Greek_OMICRON, U2205 ] }; // ο Ο ∅
    key <AD10> { [              Greek_pi,       Greek_PI, U2119 ] }; // π Π ℙ
    
    key <AC01> { [           Greek_alpha,    Greek_ALPHA, U2200 ] }; // α Α ∀
    key <AC02> { [           Greek_sigma,    Greek_SIGMA, U222B ] }; // σ Σ ∫
    key <AC03> { [           Greek_delta,    Greek_DELTA, U2202 ] }; // δ Δ ∂
    key <AC04> { [             Greek_phi,      Greek_PHI ] }; // φ Φ
    key <AC05> { [           Greek_gamma,    Greek_GAMMA ] }; // γ Γ
    key <AC06> { [             Greek_eta,      Greek_ETA ] }; // η Η
    key <AC07> { [              Greek_xi,       Greek_XI ] }; // ξ Ξ
    key <AC08> { [           Greek_kappa,    Greek_KAPPA ] }; // κ Κ
    key <AC09> { [           Greek_lamda,    Greek_LAMDA ] }; // λ Λ
    key <AC10> { [            U002B, U2212, U00B1, U2213 ] }; // + − ± ∓
    
    key <AB01> { [         Greek_upsilon,  Greek_UPSILON ] }; // υ Υ
    key <AB02> { [             Greek_chi,      Greek_CHI ] }; // χ Χ
    key <AB03> { [             Greek_psi,      Greek_PSI, U2102 ] }; // ψ Ψ ℂ
    key <AB04> { [           Greek_omega,    Greek_OMEGA ] }; // ω Ω
    key <AB05> { [            Greek_beta,     Greek_BETA ] }; // β Β
    key <AB06> { [              Greek_nu,       Greek_NU, U2115 ] }; // ν Ν ℕ
    key <AB07> { [              Greek_mu,       Greek_MU ] }; // μ Μ
    
    key <LSGT> { [                  less,        greater, U2264, U2265 ] }; // <  > ≤ ≥
    
    key <TLDE> { [        U00BD,       U00BC, U215B, asciitilde ] }; // ½ ¼ ⅛ ~
    key <AE01> { [            1,      exclam, U00AC ] }; // 1 ! ¬
    key <AE02> { [            2,          at ] }; // 2 @
    key <AE03> { [            3,       U2208, U2209, U220B ] }; // 3 ∈ ∉ ∋
    key <AE04> { [            4,      dollar ] }; // 4 $
    key <AE05> { [            5,     percent ] }; // 5 %
    key <AE06> { [            6, asciicircum ] }; // 6 ^
    key <AE07> { [            7,   ampersand ] }; // 7 &
    key <AE08> { [            8,    asterisk ] }; // 8 *
    key <AE09> { [            9,   parenleft ] }; // 9 (
    key <AE10> { [            0,  parenright, U221E ] }; // 0 ) ∞
    key <AE11> { [        minus,  underscore ] }; // - _
    key <AE12> { [        equal,       U2260, U2248, U2249 ] }; // = ≠ ≈ ≉
    
    key <AD11> { [  bracketleft,   braceleft ] }; // [ {
    key <AD12> { [ bracketright,  braceright ] }; // ] }
    
    key <AC11> { [   apostrophe,    quotedbl, asterisk, U2020 ] }; // ' " * †
    
    key <AB08> { [        U2190,     U2192, U2193, U2191 ] }; // ← → ↓ ↑
    key <AB09> { [       period,     U2219, U2026, U22EE ] }; // . ∙ … ⋮
    key <AB10> { [        U21D2,     U21D0, U21D4 ] }; // ⇒ ⇐ ⇔
    key <BKSL> { [    backslash,         bar ] }; // \ |
};