All about the Grothendieck construction
A model category for the homotopy theory of concurrency
State-to-state rotational transitions in H$_2$+H$_2$ collisions at low
  temperatures Ionization Cluster Size Distributions Created by Low Energy Electrons
  and Alpha Particles in Nanometric Track Segment in Gases A cautionary tale on the efficiency of some adaptive Monte Carlo schemes Singular cotangent model On the Feasibility of Portfolio Optimization under Expected Shortfall Does the measurement take place when nobody observes it? Solving for the low-rank tensor components of a scattering wave function Dynamics of fibered endomorphisms of $\mathbb P^k$ A Commentary on the Linearity and Time-Invariance of ODE-Based Systems Representation of Context-Specific Causal Models with Observational and
  Interventional Data Extension of the CEM2k and LAQGSM Codes to Describe Photo-Nuclear
  Reactions Observational signatures of neutron stars in low-mass X-ray binaries
  climbing a stability peak Measurement of the Electrical Properties of a Thundercloud Through Muon
  Imaging by the GRAPES-3 Experiment Nonorthogonal Bases and Phase Decomposition: Properties and Applications Revisiting the Complexity Analysis of Conflict-Based Search: New
  Computational Techniques and Improved Bounds All Optical Scheme for Strongly Enhanced Production of Dipolar Molecules
  in the Electro-Vibrational Ground State Neural network approximation and estimation of classifiers with
  classification boundary in a Barron class Computational Methods for a Class of Network Models GOE-GUE-Poisson transitions in the nearest neighbor spacing distribution
  of magnetoexcitons Closed Form Fractional Integration and Differentiation via Real
  Exponentially Spaced Pole-Zero Pairs Error-Correction Capability of Reed-Muller codes On partitions into squares of distinct integers whose reciprocals sum to
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math.AT math.CT