<P> The nabla is a triangular symbol like an inverted Greek delta : ∇ ( \ displaystyle \ nabla ) or ∇ . The name comes , by reason of the symbol 's shape , from the Hellenistic Greek word νάβλα for a Phoenician harp , and was suggested by the encyclopedist William Robertson Smith to Peter Guthrie Tait in correspondence . </P>
<P> The nabla is a triangular symbol like an inverted Greek delta : ∇ ( \ displaystyle \ nabla ) or ∇ . The name comes , by reason of the symbol 's shape , from the Hellenistic Greek word νάβλα for a Phoenician harp , and was suggested by the encyclopedist William Robertson Smith to Peter Guthrie Tait in correspondence . </P>
what is the upside down triangle in calculus
what is the upside down triangle in calculus
nabla
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