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Article Contents

ABSTRACT

1.INTRODUCTION

2.THE THEORY OF INTERFEROMETRY AND APERTURE SYNTHESIS

2.1.Fundamentals

2.2.Sources of error in VLBI observations

2.3.The problem of phase calibration: self-calibration

2.4.Polarization

2.5.Spectral line VLBI

2.6.Pulsar gating

2.7.Wide-field limitations

2.8.VLBI at mm wavelengths

2.9.The future of VLBI: eVLBI, VLBI in space, and the SKA

2.10.VLBI arrays around the world and their capabilities

3.ASTROPHYSICAL APPLICATIONS

3.1.Active Galactic Nuclei and their jets

3.2.Stars

3.3.Results from astrometric observations

4.CONCLUSIONS

REFERENCES