The term differential calculus is identified in base64 scheme by the sequence ZGlmZmVyZW50aWFsIGNhbGN1bHVz, while the MD5 signature is equal to dbc7c155c0aa1cc30aa60fd96ac8c0b2. The ASCII encoding of differential calculus in hexadecimal notation is 646966666572656e7469616c2063616c63756c7573.