In mathematics, a one-parameter group or one-parameter subgroup usually means a continuous group homomorphism
- φ : R → G
from the real line R (as an additive group) to some other topological group G. That means that it is not in fact a group, strictly speaking; if φ is injective then φ(R), the image, will be a subgroup of G that is isomorphic to R as additive group.
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