dissenting:
At approximately seven o’clock on the evening of May 18, 1977, Barry Greer, while riding his bicycle on a public street in Philadelphia, was assaulted by appellant and a co-defendant. The co-defendant, holding a knife, punched Greer and thereby caused him to fall from the bicycle. Greer fled, and appellant picked up the bicycle. The co-defendant, still brandishing the knife, pursued the fleeing Greer, but Greer eluded his pursuer. Appellant ran in another direction and took the bicycle with him. Greer subsequently hailed a passing police wagon. Appellant and his co-defendant were found a short time later with the bicycle and were placed under arrest. Appellant was subsequently tried nonjury and convicted of aggravated assault, robbery, criminal conspiracy and possession of an instrument of crime. The majority holds that the facts of the case will not support convictions *587for both robbery and aggravated assault. I disagree and, therefore, respectfully dissent.
Appellant has argued that the judgment of sentence for aggravated assault should be vacated because robbery “necessarily involves” an aggravated assault and, therefore, the offense of aggravated assault merged into the offense of robbery. The majority rejects the merger argument without discussion but grants relief because it finds the evidence insufficient to convict of both offenses. My reading of the statutory definitions persuades me that the crimes with which appellant was charged required proof of different elements. The aggravated assault with which appellant was charged was not a necessary ingredient of robbery, and the same facts did not necessarily prove both. Therefore, the former did not merge into the latter. Commonwealth v. Sparrow, 471 Pa. 490, 503-507, 370 A.2d 712, 718-721 (1977); Commonwealth v. Hill, 453 Pa. 349, 310 A.2d 88 (1973); Commonwealth v. Lezinsky, 264 Pa.Super. 476, 400 A.2d 184 (1979); Commonwealth v. Olsen, 247 Pa.Super. 513, 372 A.2d 1207 (1977). See also: Commonwealth v. Carter, 482 Pa. 274, 393 A.2d 660 (1978). My review of the evidence, moreover, discloses sufficient evidence to support the court’s finding that appellant was guilty of both offenses.
Appellant was charged and convicted of violating the following sections of the Pennsylvania Crimes Code:
§ 2702.1 Aggravated assault.
(a) Offense defined. — A person is guilty of aggravated assault if he:
(4) attempts to cause or intentionally or knowingly causes bodily injury to another with a deadly weapon. § 3701.2 Robbery.
(a) Offense defined.—
*588(1) A person is guilty of robbery if, in the course of committing a theft, he:
(ii) threatens another with or intentionally puts him in fear of immediate serious bodily injury.
From these sections, it can be observed that robbery required proof of a threat of serious bodily harm3 or the putting of Greer in fear of immediate, serious bodily injury. It did not require that serious bodily injury actually be inflicted or even attempted. The charge of aggravated assault, on the other hand, required the Commonwealth to prove an attempt to inflict bodily injury4 upon Greer with a deadly weapon. An “attempt” is defined by Section 901(a)5 of the Crimes Code as the doing of an act which constitutes a substantial step toward the commission of a crime which the actor specifically intends to commit.
The evidence was sufficient to show that Greer had been threatened with or put in fear of serious bodily injury in connection with the theft of his bicycle. The fact finder could also find that appellant and his accomplice had, by pursuing Greer with a drawn knife, taken a substantial step toward inflicting bodily injury upon Greer with a deadly weapon and with the specific intent of causing such injury. Even a single act or series of acts may constitute two separate offenses if each offense requires proof of facts additional to or different from those required to prove the other. Commonwealth v. Grassmyer, 266 Pa.Super. 11, 402 A.2d 1052 (1979); Commonwealth v. Ruehling, 232 Pa.Super. 378, 334 A.2d 702 (1975). Because the trial court could properly find that appellant committed the several crimes of robbery and aggravated assault, I would affirm the convictions and the concurrent sentences imposed therefor.
. 18 Pa.C.S. § 2702.
. 18 Pa.C.S. § 3701.
. Serious bodily injury and bodily injury are defined separately in 18 Pa.C.S. § 2301.
. See: Note 3, supra.
. 18 Pa.C.S. § 901(a).