Abstract
We identify the two dimensional torus T2 with the quotient space ℝ2/ℤ2. We consider a function φ ∈ C1(T2, ℝ) having a maximum at M and a minimum at m.
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© 1996 Birkhäuser
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Willem, M. (1996). Relative category. In: Minimax Theorems. Progress in Nonlinear Differential Equations and Their Applications, vol 24. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-4146-1_6
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DOI: https://doi.org/10.1007/978-1-4612-4146-1_6
Publisher Name: Birkhäuser Boston
Print ISBN: 978-1-4612-8673-8
Online ISBN: 978-1-4612-4146-1
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