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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Bundle <strong>Geom</strong>etry 683⎛⎞cos 2t − sin 2t 0 0τ( exp( t w − 1 ) ) = ⎜sin 2t cos 2t 0 0⎟⎝ 0 0 cos 2t sin 2t⎠0 0 − sin 2t cos 2t⎛⎞cos 2t 0 − sin 2t 0τ( exp( t w − 2 ) ) = ⎜ 0 cos 2t 0 − sin 2t⎟⎝sin 2t 0 cos 2t 0 ⎠0 sin 2t 0 cos 2t⎛⎞cos 2t 0 0 − sin 2tτ( exp( t w − 3 ) ) = ⎜ 0 cos 2t sin 2t 0⎟⎝ 0 − sin 2t cos 2t 0 ⎠ .sin 2t 0 0 cos 2tThe map C + (R 4 ) −→ H ⊕ H has the following images1 ↦→ 1 ⊕ 1, Γ = −e 1 e 2 e 3 e 4 ↦→ 1 ⊕ −1w + 1 ↦→ −2 i ⊕ 0, w− 1 ↦→ 0 ⊕ 2 iw + 2 ↦→ −2 j ⊕ 0, w− 2w + 3 ↦→ 2 k ⊕ 0, w− 3↦→ 0 ⊕ −2 j↦→ 0 ⊕ 2 k,while the inverse H ⊕ H −→ C + (R 4 ) has the following images1 ⊕ 0 ↦→ 1 + Γ , 0 ⊕ 1 ↦→ 1 − Γ22i ⊕ 0 ↦→ − w+ 12j ⊕ 0 ↦→ − w+ 22, 0 ⊕ i ↦→ w− 12, 0 ⊕ j ↦→ − w− 22k ⊕ 0 ↦→ w+ 32 , 0 ⊕ k ↦→ w− 32 .So, the map Spin(4) −→ SU(2) × SU(2) hasexp( t Λ + ) −→ SU(2) × 1 SU(2),exp( t Λ − ) −→ 1 SU(2)× SU(2),

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