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MathOverflow is a hosted instance of the SE stack, while the "Mathematics Stack Exchange" is part of the Stack Exchange network (started in their Area 51, "grad
by evanhanson 16y ago
MathOverflow is a hosted instance of the SE stack, while the "Mathematics Stack Exchange" is part of the Stack Exchange network (started in their Area 51, "graduated", etc). The former is mainly for academics and professionals in the field, while the latter is more elementary and geared more towards the average user.