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 Algebra (2)

Lagrange's Four Square Theorem
Discrete Valuation Rings

 Number Theory (1)

Lagrange's Four Square Theorem

 analysis (2)

Smooth dependence of trajectories on initial conditions/parameters
Differentiable Manifolds

 calculus (2)

Smooth dependence of trajectories on initial conditions/parameters
Differentiable Manifolds

 combinatorics (3)

Posets
Topics in Combinatorics
Posets

 differential equations (1)

Smooth dependence of trajectories on initial conditions/parameters

 geometry (2)

Smooth dependence of trajectories on initial conditions/parameters
Differentiable Manifolds

 manifolds (1)

Differentiable Manifolds